waterproof /ˈwɔ:təpru:f/ I. adj. 不透水的；防水的：waterproof material防水材料；a waterproof hat防水帽My mother bought me a waterproof watch.我妈妈给我买了一块防水手表。An umbrella should be waterproof.雨伞应能防水。
‖II. n. [c] 不透水的织物；雨衣：Take a waterproof —it’s going to be wet.带件雨衣——天会下雨。
watershed /ˈwɔ:təʃed/ n. ［c］分水岭，转折点：important(major, significant)watershed重要（主要）分水岭；重要的转折点 Our marriage was at a watershed.我们的婚姻到了一个转折关头。Darwin’s theory of evolution was a watershed dividing the old way of thinking from the new.达尔文的进化论是划分新旧思维方式的分水岭。The granting of the vote represented a watershed for the rights of women.获得选举权标志着妇女权利的转折点。
watertight /ˈwɔ:tətait/ adj. 1.不透水的，防水的：a watertight box (watch) 不透水盒(防水表) 2.严密的，无懈可击的：a watertight argument (excuse) 滴水不漏的辩论词(天衣无缝的借口)
