you need to smile
你需要微笑
以上为机器翻译结果，长、整句建议使用 人工翻译 。
You shouldn't be too serious. You need to smile more often.
你不应该太严肃，你要多微笑。
youdao
Life needs a sweet smile and you need to smile when you are frustrated.
生活需要微笑，沮丧时对自己笑笑。
He replied, with a reassuring smile, "Oh, you don't need to worry about them."
他面带鼓励的微笑答道：“哦，你不必为他们担心。”
《柯林斯英汉双解大词典》
So if you want an authoritative, neutral appearance while having to announce bad news, you still need to smile slightly.
FORBES: Smile For The Camera -Media Training
All you need is a slight smile to look more comfortable, confident and relaxed.
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