The pig nosed the trough down.
猪把食槽拱翻了。
A lee trough over the leeward side is induced by the interaction of orography with the cold front.
当静止冷锋移离地形时,由于地形作用可在锋面暖域、地形下游形成一个背风槽。
A deep trough divides the two parts of the Antarctic.
一道很深的海沟把南极洲一分为二。
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