词典释义：
释义
without any doubt
肯定地，确切地，无疑地
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I don’t know for certain .我并不确切知道。
双语例句
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For certain personal reasons I shall not be able to attend.
由于某种个人原因，我将不能出席。
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Some soils are actually too alkaline for certain plant life.
有些土壤的碱性，实际上对某些植物的生长是过高的。
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The courts were empowered to impose the death sentence for certain crimes.
法院有权因某些罪行判处罪犯死刑。
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"That's Kay for certain," said Gerda.
"那一定是加伊！”格尔达说。
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"Yes, yes; for certain that was Kay," said Gerda.
“是的，是的；那一定是加伊。”格尔达说。
近义词
百科
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We have no way of knowing for certain. But, it's clear that people are far too emotional right now to make a rational decision.
现在还不知道，现在人们的情绪太过激动了，无法做出理性的决定。
《The Hunger Games: Mockingjay - Part 2》《饥饿游戏3：嘲笑鸟(下)》
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But looking at the fossil record, knowing what I know about this infection, you cannot say for certain it isn't what killed off the dinosaurs.
但是看看化石记录，加上我对感染的了解，你不能完全否认当初灭绝恐龙的就是这东西。
《The Walking Dead S4》《行尸走肉 第四季》