知识扩展
习语积累
习语 n. (in) midstream 在进行中；在中途 in the middle of doing sth; while sth is still happening Their conversation was interrupted in midstream by the baby crying. 他们的谈话被婴儿的啼哭打断了。 change horses in midstream 中流换马；中途变卦；中途支持另外的人（或事） to change to a different or new activity while you are in the middle of sth else; to change from supporting one person or thing to another
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