我弄不懂他们为什么嘲笑这一建设性提议的翻译：I don't understand why they laugh at this constructive proposal 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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I don't understand why they laugh at this constructive proposal

Why can't I make them to ridicule this constructive proposition

I wondered why they were laughing at this constructive proposal

I don't understand why they laugh at this constructive proposal