速度速度 只形容词
be busy doing sth 忙于做某事
be worth doing sth 值得做某事
feel nervous doing sth 做某事感到紧张
it is useless doing 作某事没有用
There is no use doing 做某事没有用
There is no good doing 做某事不好
这些可以嘛？
be worth doing sth 值得做某事
feel nervous doing sth 做某事感到紧张
it is useless doing 作某事没有用
There is no use doing 做某事没有用
There is no good doing 做某事不好
这些可以嘛？
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