[译] 在过去的 50 年中这里变化很大。
[误] There have been a lot of changes here in the past 50 years.
[正] There have been a lot of changes here in the last 50 years.
[注] 形容词 last（=after all others）意为"最后的"，也可译为"过去的"。如：All of those houses have been built in the last 20 years. 所有这些房子都是过去 20 年当中建造的。past（=a little earlier than the present）意为"过去的"，此时意义与 last 相近，但所用介词不同。如：She has not been feeling very well for the past few days. 过去几天里她一直觉得不舒服。/We have lived here for the past 40 years. 过去 40 年我们一直住在这里。如果 past 置于数词 + 名词的词组之后，意为"好久以前"（=long ago）。如：Our house was built 100 years past. 我们的住房是 100 年前建造的。
