0 a long, narrow container without a lid that usually holds water or food for farm animals -- 槽；饮水槽；饲料槽
1 a low point in a regular series of high and low points -- 低谷；低谷期，萧条期
2 to eat something quickly and eagerly, especially in large amounts -- 大吃，饕餮，狼吞虎咽
3 to reach a low level, price, etc. before going up again -- 在上升之前落入（程度，价格等的）低谷
Large-scale troughs as well as planar cross-strata are abundant in the lower part, whereas small-scale cross-strata are characteristic of the upper part.
Even in the recessionary troughs, unemployment levels remained low by international standards.
There are some peaks and troughs, as we might expect given the changing political context, but no clear pattern.
In cases of lower flow rates, these steepen until reaching a critical height, and hence a limiting configuration with sharp crests and broad troughs.
The hay was chopped and placed in troughs made out ofmetal drums.
At both sites, fruit development times and the timing of both peaks and troughs of communitywide flowering and fruiting all track seasonal variation in irradiance.
The contingency analysis used monthly presence/absence data to identify species with multiple peaks or troughs in reproductive activity.
Note that nonlinearity will produce a qualitative difference between crests and troughs of the standing wave.
