2N-COUNT (两个大浪之间的)波谷 A trough is a low area between two big waves on the sea. (两个大浪之间的)波谷
The boat rolled heavily in the troughs between the waves. [+ between]
船在波涛起伏的海浪中剧烈摇摆。
3N-COUNT (商业活动等的)淡季,低谷 A trough is a low point in a process that has regular high and low points, for example a period in business when people do not produce as much as usual. (商业活动等的)淡季,低谷
Looking back afterwards you will see that this was not a terminal trough in your career. [+ in]
今后回想起来你就会明白,这并非你事业中一蹶不振的低谷。
American bank shares have risen by 60% since their trough last October.
美国的银行股自从去年 10 月跌入低谷以来已经上涨了 60%。
4N-COUNT 低压槽 A trough of low pressure is a long narrow area of low air pressure between two areas of higher pressure. 低压槽 [technical]
The trough of low pressure extended over about 1000 kilometres.