a long, narrow open container for animals to eat or drink out of (给动物进食或饮水的)槽 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 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 ■(Mathematics)a region around the minimum on a curve of variation of a quantity (数)凹点 ■a point of low achievement or satisfaction 低谷(成绩小或不令人满意) 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。
语源
Old English trog, of Germanic origin; related to Dutch trog and German Trog, also to tree