流势是指水流的快慢和强弱：河水～很急ㄧ洪水经过闸门～稳定。
地质构造作用，控制河流的走向和流势；
The geological structure controls the trend and the flow of the river.
你可以借水龙头的流势来制造更多泡泡，不过我同意这几款泡泡浴液的确不是高泡泡配方。我旅行的时候喜欢带上它们！
You can create some bubbles by adding the liquid under the tap, but I agree this is not a high-bubble formula.
洪水肆虐巴中市低势地区，造成交通和通信线路瘫痪，并引发泥石流。
Flood ravaged low areas of Bazhong City, paralyzing traffic and phone services and causing mudslides.
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