Classfication
分類
??? 情景例句
In a word, we'll provide you with all good service.
我們將為你們提供最好的服務。
Don't put off till tomorrow what should be done today.
今日事，今日畢。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低點）、浪高（從波谷到浪峰的垂直距離）