We say them when someone hands us a letter, passes us a book, offers us a drink, or lends us an umbrella.

当某人递给我们一封信，递给我们一本书，给我们一杯饮料，或者借给我们一把伞时，我们就会说它们。

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On a visit to London's prestigious Bartlett School, Quest takes a crash course in design, lends his ideas to a class project and tries to understand why it takes architects so long to get their hands on a real building.

CNN: A Quest to build