英语翻译A：How come you didn't give birth in water?为什麽你不在水里生呢?B：W

1 How come you didn't give birth in water?---------多用于口语,尤其是熟人之间.
=== How did it come that you didn't give birth in water?
其中,How did it come that you didn't give birth in water--------是主语从句.
How did it（it是形式主语） come that（that是主语从句连接词） you didn't give birth in water（后面真正主语）
2 Why didn't you give birth in water?----------why是标准的用法,书面的和口语的.

how come 口语化程度比较高 表示疑问 困惑 不解 可以看成 how did it come 的省略。 这句话 相当于 how did it come (that) you didn't give birth in water?

How come 单独解释就是：怎么回事、怎么搞的。如果平时的沟通问how are you? 对方回答 Not so good，你就可以问How come? 意思想知道对方怎么了，发生了什么事情么？这个时候就可以用why来代替。意思是想通的。
但是有的时候就不能互相代替，比如说 有人告诉你某某事，你说 "How come i didnt know?" 意思是说，我怎么不知道？这里用why就...

这两句在语气上有所不同。翻译中文如下：

A：你怎么就不采用水中生产？
B：为什么你不在水中生产？

以上译文说明两个句型的差别。同意请采纳哈！

两句一样，前者更口语化，就是这样