蔷薇朵朵7
你好！一定certain 英[ˈsɜ:tn] 美[ˈsɜ:rtn] adj. 某一; 必然的; 已确定的; pron. [动词用复数] 某些; [例句]She's absolutely certain she's going to make it in the world她坚信自己会出人头地。
Macchiato~0704
1、certain英[ˈsɜːtn]美[ˈsɜːrtn]，pron.(不提及人或事物的名称时用)某些;adj.肯定; 确定; 确实; 确信; 无疑; (不提及细节时用)某事，某人，某种; 某某，某位，一位叫…的; 轻微的。 2、[例句]Certain of those present were unwilling to discuss the matter further.某些在场的人不愿意进一步讨论这个问题。
艾利希尔
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.
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