Please be serious about your work.
请认真对待你的工作。
Please be serious for a minute, this is very important.
请严肃点儿，这事很重要。
Please be serious for a minute, this is very important.
请严肃点儿，这事很重要。
Note: please be serious in choosing wipes with a sticky feeling and smell.
温馨提醒：有黏腻感和带有香味的湿巾请谨慎选择。
Oh, please! You cannot be serious.
喔，得了吧！你准是在打哈哈。
My boss found some careless mistakes in your proposal, please be more serious.
老板在你的提议中找出了粗心的错误，请再认真细心点儿。
Please remember your graduation thesis is meant to be serious.
请记住你的毕业论文必须是严肃的。
Please remember your graduation thesis is meant to be serious.
请记住你的毕业论文必须是严肃的。
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