certainly /ˈsɚtn̩li/ adverb Learner's definition of CERTAINLY
1
: without doubt : definitely无疑；确定；肯定 -
It will certainly rain tomorrow.明天肯定会下雨。
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This year's festival was certainly much better than last year's.毫无疑问，今年的庆祝活动比去年的好多了。
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Certainly [=surely] you can do a better job than that!你一定能做得更好！
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I'm certainly going to try.我一定会去尝试的。
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The new version is most certainly easier to use.新版本用起来必然更简单。
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The snake that bit her was almost certainly poisonous.几乎可以肯定，咬她的是条毒蛇。
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sometimes used for emphasis有时用于强调 -
He didn't get the raise he was hoping for, but he's certainly not complaining.他并未获得自己所期望的加薪，但他绝对没有抱怨。
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I certainly didn't mean to offend anyone.我绝无意冒犯任何人。
2
: of course —
used to answer questions当然（用于回答问题） -
“Can I speak to you for a moment?” “Certainly.”“能跟你聊会儿吗？”“当然可以。”
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“Did I offend you?” “Oh, certainly not.” [=no, you did not offend me at all]“我惹您生气了吗？”“哦，当然没有。”
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“May I join you?” “You most certainly may.”“我可以跟你们一块儿吗？”“当然可以。”