For the word speed, for example, a past-tense change from sped to speeded may have been accelerated by a shift in the word's meaning from "to move rapidly" towards "to exceed the speed limit."

例如speed，它的过去式从sped变为speeded，这可能是因为该单词的意义由“快速移动”到“加速”的转变。

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But in other ways a shift would have real meaning.

但在另外的方面，债务转移有其实际的意义。

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But it's not just awkwardness-doctors now know that teenagers' body clocks go through a shift during puberty, meaning they find it hard to sleep before 11 p.m. and hard to wake in the morning.

但这并不尴尬——现在医生知道青少年的生物钟在青春期会经历一个转变，也就是说他们发现晚上11点之前很难入睡，而早晨的时候又很难醒来。

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