[yī dìng]
（規定的， 確定的） fixed; established; regular
established rules and regulations
一定的規章制度
fixed production quota
一定的生產指標
work according to specifications
按照一定的規格進行生產
There are fixed times for study and for work.
學習、 工作都有一定的時間。
Every sort of spring has a definite elasticity.
每一種彈簧都有一定的彈性。
This must be the book he wants to buy.
這一定是他想買的書。
Provided we do all this, we shall assuredly succeed in our reform.
只要我們做到這一切， 改革就一定能成功。
I shall definitely be home before six o'clock.
6點以前， 我一定回家。
to a certain degree
在一定程度上
under given conditions
在一定條件下
in a certain sense
在一定意義上
within a certain [definite] period
在一定的時期內
Metals will melt when heated to a certain temperature.
金屬加熱到一定的溫度都會熔化。
reach a fairly high level
達到一定水平
attach due importance to
給予一定的重視