为您解答
这个源自一个短语
Be in the wash
就表示在洗，或在等待被洗
这里没有表示be的状态系动词，就是表示在被洗的过程中。
参考一下:
phrase
If you say that something such as an item of clothing is in the wash, you mean that it is being washed, is waiting to be washed, or has just been washed and should therefore not be worn or used.
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