短語(yǔ)詞組短語(yǔ)eastward back -flow 偏東回流storm back -flow 風(fēng)暴回流baoyance back -flow 浮力回流back -flow nozzle 回流式噴嘴backflow preventer 回流防止器；防止回流設(shè)施 返回 back-flow