midstream
n. 中流，河流正中
例句
The boat floated rapidly in midstream.
船在中流飞快地漂行。
《新英汉大辞典》
I was cut off in midstream.
我说到半截被打断了。
《柯林斯英汉双解大词典》
Their boat had capsized in midstream.
他们的船在河中央翻了。
