cross stream velocity component 横向分速度
cross-stream instability 交叉流不稳定性
cross the stream 越过小溪 ; 穿过小溪 ; 穿过河流
cross a stream 渡过水流
stream cross section 河段面 ; 河流横断面
One chilly night when I was hiking in the Rocky Mountains with some students, I mentioned that we were going to cross a mountain stream.
一个寒冷的夜晚，当我和几个学生在落基山脉徒步旅行时，我提到我们将要渡过一条山间小溪。
Was the little stream able to cross the desert at first?
起初这条小溪能穿过沙漠吗？
Or is she an elfish spirit, who, as the legends of our childhood taught us, is forbidden to cross a running stream?
要不，说不定她是个小精灵，象我们儿时的童话所教的，她是不准渡过流淌的溪流的吧？
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