| 单词 | polar trough |
| 释义 | polar trough [`pō·lǝr `trȯf] METEOROLOGY In tropical meteorology, a wave trough in the circumpolar westerlies having sufficient amplitude to reach the tropics in the upper air; at the surface it is reflected as a trough in the tropical easterlies, but at moderate elevations it is characterized by westerly winds. |
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