he always knows everything
他总是无所不知
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Xiaoming always asks why and he'll never be satisfied until he knows everything.
小明老爱问为什么，老爱打破沙锅问到底。
《新英汉大辞典》
I can't stand him, for he always talks as though he knows everything.
我受不了他了，他讲话总是像他什么都知道似的。
youdao
"Arsene is always watching these kids and knows everything about them, " he said.
BBC: Bould sets bar for Arsenal youth
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