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You become so deeply absorbed in an activity that you lose track of time.

你是那么专注于一项活动，以致忘了时间。

《柯林斯英汉双解大词典》

It is so deeply planted in our mind that we still use it now.

它深深地根植在我们的脑海中，我们现在仍然在使用它。

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Before Sigmund Freud, no modern scientist had looked so deeply into the human mind.

VOA: special.2010.04.13

So given all of the controversies raging around the question of the proper government of the church, and Milton is deeply invested in these matters, Milton feels obliged to do something.

因此考虑到对应当来领导教会的适当政府的问题,所引发的相当争议，弥尔顿已经深深的陷在这些事务里，无法脱身了，他觉得自己需要做些什么。

耶鲁公开课 - 弥尔顿课程节选

So, children are deeply abused and neglected. What else do we have?

因此，孩子们被无情地虐待和忽略，我们还看到了其他东西吗？

耶鲁公开课 - 1945年后的美国小说课程节选

But she was so shaken, so deeply tired that she could hardly stir a foot.

NEWYORKER: Free Radicals

Christ's presence, followed by Christ's absence, impressed him so deeply that he asked to be baptised.

ECONOMIST: Cardinal Lustiger

Organizations need to create similar room for jam sessions as Steve Jobs so deeply understood.

CNN: STORY HIGHLIGHTS