动画延迟在iOS上无法正常工作,为什么？

我在代码段中有以下代码.它除了iOS之外的任何地方都可以正常工作 - 我认为问题在于动画延迟,因为一些动画段落在同一时间动画.你可以看到演示http://stassabiomassa.com/(从左龙的头部出来的话).

有人知道这个问题吗？请帮忙.谢谢!

.dragon-speech:nth-of-type(1){
    -webkit-animation-name: dragon-speech_animation;
    -moz-animation-name: dragon-speech_animation;
    -ms-animation-name: dragon-speech_animation;
    -o-animation-name: dragon-speech_animation;
    animation-name: dragon-speech_animation;
    -webkit-animation-duration: 10s;
    -moz-animation-duration: 10s;
    -ms-animation-duration: 10s;
    -o-animation-duration: 10s;
    animation-duration: 10s;
    -webkit-animation-timing-function: linear;
    -moz-animation-timing-function: linear;
    -ms-animation-timing-function: linear;
    -o-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-delay: 0.2s;
    -moz-animation-delay: 0.2s;
    -ms-animation-delay: 0.2s;
    -o-animation-delay: 0.2s;
    animation-delay: 0.2s;
    -webkit-animation-iteration-count: infinite;
    -moz-animation-iteration-count: infinite;
    -ms-animation-iteration-count: infinite;
    -o-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-fill-mode: forwards;
    -moz-animation-fill-mode: forwards;
    -ms-animation-fill-mode: forwards;
    -o-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
}

.dragon-speech:nth-of-type(2){
    -webkit-animation-name: dragon-speech_animation;
    -moz-animation-name: dragon-speech_animation;
    -ms-animation-name: dragon-speech_animation;
    -o-animation-name: dragon-speech_animation;
    animation-name: dragon-speech_animation;
    -webkit-animation-duration: 10s;
    -moz-animation-duration: 10s;
    -ms-animation-duration: 10s;
    -o-animation-duration: 10s;
    animation-duration: 10s;
    -webkit-animation-timing-function: linear;
    -moz-animation-timing-function: linear;
    -ms-animation-timing-function: linear;
    -o-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-delay: 2.2s;
    -moz-animation-delay: 2.2s;
    -ms-animation-delay: 2.2s;
    -o-animation-delay: 2.2s;
    animation-delay: 2.2s;
    -webkit-animation-iteration-count: infinite;
    -moz-animation-iteration-count: infinite;
    -ms-animation-iteration-count: infinite;
    -o-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-fill-mode: forwards;
    -moz-animation-fill-mode: forwards;
    -ms-animation-fill-mode: forwards;
    -o-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
}

.dragon-speech:nth-of-type(3){
    -webkit-animation-name: dragon-speech_animation;
    -moz-animation-name: dragon-speech_animation;
    -ms-animation-name: dragon-speech_animation;
    -o-animation-name: dragon-speech_animation;
    animation-name: dragon-speech_animation;
    -webkit-animation-duration: 10s;
    -moz-animation-duration: 10s;
    -ms-animation-duration: 10s;
    -o-animation-duration: 10s;
    animation-duration: 10s;
    -webkit-animation-timing-function: linear;
    -moz-animation-timing-function: linear;
    -ms-animation-timing-function: linear;
    -o-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-delay: 4.2s;
    -moz-animation-delay: 4.2s;
    -ms-animation-delay: 4.2s;
    -o-animation-delay: 4.2s;
    animation-delay: 4.2s;
    -webkit-animation-iteration-count: infinite;
    -moz-animation-iteration-count: infinite;
    -ms-animation-iteration-count: infinite;
    -o-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-fill-mode: forwards;
    -moz-animation-fill-mode: forwards;
    -ms-animation-fill-mode: forwards;
    -o-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
}

.dragon-speech:nth-of-type(4){
    -webkit-animation-name: dragon-speech_animation;
    -moz-animation-name: dragon-speech_animation;
    -ms-animation-name: dragon-speech_animation;
    -o-animation-name: dragon-speech_animation;
    animation-name: dragon-speech_animation;
    -webkit-animation-duration: 10s;
    -moz-animation-duration: 10s;
    -ms-animation-duration: 10s;
    -o-animation-duration: 10s;
    animation-duration: 10s;
    -webkit-animation-timing-function: linear;
    -moz-animation-timing-function: linear;
    -ms-animation-timing-function: linear;
    -o-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-delay: 6.2s;
    -moz-animation-delay: 6.2s;
    -ms-animation-delay: 6.2s;
    -o-animation-delay: 6.2s;
    animation-delay: 6.2s;
    -webkit-animation-iteration-count: infinite;
    -moz-animation-iteration-count: infinite;
    -ms-animation-iteration-count: infinite;
    -o-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-fill-mode: forwards;
    -moz-animation-fill-mode: forwards;
    -ms-animation-fill-mode: forwards;
    -o-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
}

.dragon-speech:nth-of-type(5){
    -webkit-animation-name: dragon-speech_animation;
    -moz-animation-name: dragon-speech_animation;
    -ms-animation-name: dragon-speech_animation;
    -o-animation-name: dragon-speech_animation;
    animation-name: dragon-speech_animation;
    -webkit-animation-duration: 10s;
    -moz-animation-duration: 10s;
    -ms-animation-duration: 10s;
    -o-animation-duration: 10s;
    animation-duration: 10s;
    -webkit-animation-timing-function: linear;
    -moz-animation-timing-function: linear;
    -ms-animation-timing-function: linear;
    -o-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-delay: 8.2s;
    -moz-animation-delay: 8.2s;
    -ms-animation-delay: 8.2s;
    -o-animation-delay: 8.2s;
    animation-delay: 8.2s;
    -webkit-animation-iteration-count: infinite;
    -moz-animation-iteration-count: infinite;
    -ms-animation-iteration-count: infinite;
    -o-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-fill-mode: forwards;
    -moz-animation-fill-mode: forwards;
    -ms-animation-fill-mode: forwards;
    -o-animation-fill-mode: forwards;
    animation-fill-mode: forwards;

}

????!
???? ?????!
?????????!
??????? ??!
????!!!

animation-delay: -9.8s;
animation-delay: -11.8s;
animation-delay: -13.8s;
animation-delay: -15.8s;
animation-delay: -17.8s;