certain
adj. /ˈsɜːrtn/ A2
肯定的；确信的
Completely confident and having no doubt.
仙境例句
“Come back!” called the Caterpillar, and Alice felt certain it had something important to say.
“回来！”毛毛虫喊道。爱丽丝确信它有什么要紧的话要说。
原著这一句
London is the capital of Paris, and Paris is the capital of Rome, and Rome—no, that’s all wrong, I’m certain!
“伦敦是巴黎的首都，巴黎是罗马的首都，罗马是——不对，这全都错了，我敢肯定！”
卡罗尔原著 · 第 2 章