小若冰MM
be sure ；of course[例句]不一定，当然，如果通过沟通，能碰到有缘人是更好的一件事，平常心吧，一切顺其自然。Not necessarily, of course, if through communication can better meet Predestiny is one thing, the sense of balance bar, all letting nature take its course.
NDSGGS南都
一定：certain.
例句：
我一定会时刻睁大眼睛提防他的行为。
I shall certainly keep a beady eye on his behaviour.
这项工作必须在一定期限内完成。
The work must be completed within a certain time limit.
我觉得我们一定是在什么地方拐错了路。
I think we must have taken a wrong turning somewhere.
一定要找个宽敞地儿坐得舒服一点。
Make sure you have plenty of room to sit comfortably.
一定要确保所有的门都锁好了再走。
See that all the doors are locked before you leave.
suki子雅
一定certain英[ˈsɜːtn]美[ˈsɜːrtn]词典fixedestablishedregular例句这项工作必须在一定期限内完成。The work must be completed within a certain time limit.
