下沉: 1.(沉没) sink; subside; submerge 短语和例子这两条船同时下沉入海。 the two boats sank together into the sea.2.(陷下去) subside; sink; cave in 短语和例子地基下沉。 the foundations have subsided
然后: then; after that; afterwards 短语和例子我们先研究一下, 然后再作决定。 we'll look into the matter first before coming to a decision. 学然后知不足。 one discovers his ignorance only through learning. 客人将在北京停留一天, 然后飞往