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一项大规模行动持续3周以从海床寻找残骸。

For three weeks a big operation went on to recover the wreckage from the sea bed.

《柯林斯英汉双解大词典》

他们被要求从城市四周的炮兵阵地上撤退。

They were asked to pull back from their artillery positions around the city.

《柯林斯英汉双解大词典》

So I thought I'd begin with a short note that one of your classmates sent to me earlier this week.

我从这周早些时候,你们其中一个同学给我的一张字条开始。

哈佛公开课 - 计算机科学课程节选

And five weeks less one day later I decided you know what this might actually be for me and I switched from pass-fail to letter graded status at that point in time.

而第五周的最后一天,我从上及格-不及格制的课程转为上数字学分制的课程,你们可能知道这对我来说意味着什么。

哈佛公开课 - 计算机科学课程节选

We'll start with Week 2 talking about Genetic Engineering; what's DNA, how can it be manipulated, how is our ability to manipulate DNA led to things like gene therapy which can now be done in people.

从第二周开始我们会讲基因工程,什么是DNA,怎么样才能操控它们,我们如何操作DNA,并将它应用于人类的基因疗法

耶鲁公开课 - 生物医学工程探索课程节选