如果没有遇见他们，我大学这几年，或许都要一个人闷闷不乐、一声不响地待在寝室里了。
If I had not met them, I would have spent my college years alone in the dorm, unhappy and silent.
如果几年来，婚姻关系不牢固，你将知道谁可能被取代。
A couple of bad years in a relationship, and you-know-who might get replaced!
科学家表示，如果不采取措施减少密西西比河的含氮量，未来几年死水区会愈发扩大。
And scientists say it will grow larger in years to come, if something is not done to reduce the amount of nitrogen in the Mississippi River.
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