短語(yǔ)詞組短語(yǔ)eastward back -flow 偏東廻流storm back -flow 風(fēng)暴廻流baoyance back -flow 浮力廻流back -flow nozzle 廻流式噴嘴backflow preventer 廻流防止器；防止廻流設(shè)施 返回 back-flow