the tide the regular rising and falling of the level of the sea海潮，潮汐:the tide is in / out ( = the sea is at a high or low level )潮涨/潮落•Is the tide going out or coming in ?现在是退潮还是涨潮？•We went for a walk and got cut off by the tide .我们去散步，结果被潮水困住了。⇒HIGH TIDE(1),LOW TIDE |