定比的用法和樣例：
例句
-
提成率應按照採用轉讓技術生產出來的產品純銷售額的一定比例來計算。
The royalty rate shall be calculated in proportion to the net sale of the product turn out with the transferred technology. -
富有的人不一定比別人幸福。
A person is no happier because he rolls in wealth.
