楼上第2题不对，不能用现在完成时。
1. I didn't understand what you said.(同义句）
=I didn't understand (your words).
2.Lu Xun died when he was 55 years old.
=Lu Xun (lived to be) 55 years old.
3.There were only 2000 TV sets around the world.
There were only 2000 TV sets (all over/round/around) the world.
your words
has lived for
all over
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