64 - ascertain, certain etc.
64.1 ascertain ( v. ) 攪清楚
64.2 certainty ( n. ) 確定性, 確定的事
64.3 certain ( adj. ) 確定, 肯定
Are you absolutely certain that you gave them the right number?
64.4 certainly ( adv. ) 確定, 肯定, (回答)當然可以
Customer : Can I have a bottle of water ?
Waiter : Certainly.
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