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更新日期:2026-08-14
keep something down 1. cause something to remain at a low level 把…控制在较低水平上: the population of aphids is normally kept down by other animals. 蚜虫的数量通常被其他动物控制在较低水平上。 2. retain food or drink in one's stomach without vomiting 不呕吐出。