Human space exploration can be a very tricky thing.
人类的对太空的探索是件很麻烦的事。
Motivation and power to make an athlete believe he can do something is a very tricky thing.
通过建立动机和力量使得运动员更加自信是一件很微妙的事情。
Motivation and power to make an athlete believe he can do something is a very tricky thing.
通过建立动机和力量使得运动员更加自信是一件很微妙的事情。
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