If you drain something, you remove the liquid from it, usually by pouring it away or allowing it to flow away, and if something drains, liquid flows away or out of it
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例句
1. Drain off the rest of the wine from this barrel. 把桶里剩余的酒排出去。 2. First, you have to drain the container of all the old oil. 首先,你得从油箱中把所有的陈油都抽去。