要使用CSS在letter-spacing属性上实现动画，您可以尝试运行以下代码
<!DOCTYPE html>
<html>
<head>
<style>
p {
letter-spacing: 3px;
animation: mymove 3s infinite;
}
@keyframes mymove {
70% {
letter-spacing: 20px;
}
}
</style>
</head>
<body>
<p>I am flying!</p>
</body>
</html>