As the book illustrates, there is a lot of boiler-plate code required in order to setup timers and determine the current progress of the animation.

正如书中所指出，为了设置定时器和确定动画的当前进度，需要编写大量必不可少却又一再重复的代码。

youdao

As the book illustrates, there is a lot of boiler-plate code required in order to setup timers and determine the current progress of the animation.

正如书中所指出，为了设置定时器和确定动画的当前进度，需要编写大量必不可少却又一再重复的代码。

youdao