[網(wǎng)絡] 當…時 while doing: 兩者同時發(fā)生doing something: 達到某個目的while sb was doing: 當…的時候; 當....時候do something worth while: 做點有用的事avoid doing something: 避免做某事下載手機詞典可隨時隨地查詞查翻譯