我们想知道这些古老的建筑是什么时候建成的的翻译：We want to know when these old buildings are built 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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We want to know when these old buildings are built

We want to know when these ancient constructions are complete

We would like to know what are these ancient buildings built in time

We want to know when these old buildings are built