[yī dìng]
（规定的， 确定的） fixed; established; regular
established rules and regulations
一定的规章制度
fixed production quota
一定的生产指标
work according to specifications
按照一定的规格进行生产
There are fixed times for study and for work.
学习、 工作都有一定的时间。
Every sort of spring has a definite elasticity.
每一种弹簧都有一定的弹性。
This must be the book he wants to buy.
这一定是他想买的书。
Provided we do all this, we shall assuredly succeed in our reform.
只要我们做到这一切， 改革就一定能成功。
I shall definitely be home before six o'clock.
6点以前， 我一定回家。
to a certain degree
在一定程度上
under given conditions
在一定条件下
in a certain sense
在一定意义上
within a certain [definite] period
在一定的时期内
Metals will melt when heated to a certain temperature.
金属加热到一定的温度都会熔化。
reach a fairly high level
达到一定水平
attach due importance to
给予一定的重视