certain/ˋsɝtṇ; ˈsɜːtn/adj 1 [not before noun 不用于名词前] completely sure 确定的﹐肯定的: +(that) I’m absolutely certain I left the keys here. 我绝对肯定我把钥匙留在这里的。+about/of Are you certain about that? 你对那事肯定吗?+what/how etc I’m not certain when it will happen. 我不确定这种情况什么时候会出现。2 sure to happen or be true 肯定发生的﹐必然的: +that It seems certain that she will win. 她获胜看来是肯定的。certain to do sth Many people look certain to lose their jobs. 许多人看来肯定要失业了。Prisoners faced certain death . 俘虏必死无疑。3 [only before noun 仅用于名词前] used to talk about a particular person, thing etc without naming or describing them exactly 某个﹔某些: The work must be done by a certain date. 这项工作必须在某个日期之前完成。You are not allowed to park in certain areas. 在某些地方是不可以停车的。This only applies to certain people. 这仅适用于某些人。4 make certaina) to check that something is correct or true 把弄…清楚﹔核实: +(that) He made certain no one could see him. 他确定没有人看见他。b) to do something in order to be sure something will happen 确保: +(that) I’ll make certain he knows about it. 我一定要让他知道这件事。5 a certaina) some but not a lot 一些的﹐一定量的: a certain amount of confusion 一些困惑to a certain extent/degree (=partly but not completely) 在一定程度上 I agree with you to a certain extent. 我在一定程度上同意你的看法。b) difficult to describe exactly 某种〔难以确切描述的东西〕: She had a certain elegance. 她身上有一种优雅的气质。6 for certain without any doubt [ for sure ] 确定﹐无疑: know/say (sth) for certain Exactly what happened is not known for certain. 无法确知到底发生了什么。