1. <span>去化学夏令营就像去上学。没有乐趣
</span>2.
<span>他还没有决定出席哪个夏令营
3.</span><span>学习动画漫画有助于做功课</span>
<span>During World War II, the US Navy needed to train large numbers of new troops. This was accomplished partially through the use of training films. As the Navy did not have a sufficient capability to produce large amounts of film on its own, it employed commercial studios to manufacture them. Disney was contracted to create many of these training films.</span>
There are several different reasons depending on the perspective you look at it.
If you're looking at it from the government perspective, then this was due to the fact that they wanted to get rid of the tradition and have a complete take over of the culture by getting rid of it.
Other explanations are that they wanted to switch an alphabet or genuinely wanted to simplify the actual characters.
Hope this helps!