Yet at any time, this tunnel could collapse.
然而,这条通道随时都可能崩溃。
In addition, enclosed the corresponding self - test topic after after studying a unit, can watch exercise answer test the score yet at any time.
另外,学习完一个单元后附有相应的自我测试题目,并且可以随时察看习题答案和测试成绩。
Time is the most precious thing we have. Yet most of us treat our time as though it has hardly any value at all.
时间是我们拥有的最宝贵的东西。但是我们大部分人对待时间的方式就好像它几乎没有价值一样。
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