词典释义：
a long, narrow open container for animals to eat or drink out of
（给动物进食或饮水的）槽
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a water trough. 水槽。
a container of a similar shape used for a purpose such as growing plants or mixing chemicals
（用于培植植物、调配化学制品的）槽形容器。
a channel used to convey a liquid
（运水的）沟槽。
a long hollow in the earth's surface
地表槽谷
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a vast glacial trough. 巨大的冰槽。
an elongated region of low barometric pressure
低压槽，槽形低压。
a hollow between two wave crests in the sea
（海水水波之间的）波谷。
a low level of economic activity
（经济周期中的）低谷期。
【数】 凹点。
a point of low achievement or satisfaction
低谷（成绩小或不令人满意）
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learning a language is a series of peaks and troughs 语言学习过程中会有一系列的高峰期和低谷期。
"Old English
