be troughing
表示正在进行的状态。
The sea is troughing violently.
海面正在剧烈地形成槽状。
狭窄的凹陷（如地球表面、海浪之间或海床）
一个长而狭的浅容器；一种槽系统。
a narrow depression (as in the earth or between ocean waves or in the ocean bed)
一种槽系统。
A system of troughs.
The troughing of the valley floor was caused by glacial erosion.
谷底的槽状凹陷是由冰川侵蚀造成的。
用法提示：troughing 在此作名词，表示谷底的槽状凹陷地形。
The farmer completed the troughing of the new feeding area.
农民完成了新喂食区的饲料槽铺设。
用法提示：troughing 在此作名词，指安装或建造饲料槽的过程。
The troughing between the waves is visible from the shore.
从岸边可以看到波浪之间的低谷。
用法提示：troughing 在此作名词，表示波浪间的凹陷部分。
表示正在进行的状态。
The sea is troughing violently.
海面正在剧烈地形成槽状。
Troughing in the channel affects navigation.
水道中的槽状凹陷影响航行。
Scientists are studying the troughing of the ocean floor.
科学家们正在研究海床的槽状结构。
troughing 指自然或人造的浅凹陷（如海槽、饲料槽），而 trenching 强调人为挖掘的狭长沟渠。
troughing 指固定的槽状容器或地理凹陷，而 guttering 特指建筑物上排雨水的檐槽或液体流动的状态。
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