on earth

on the earth/on earth都有在地球上,在地上的意思,

one earth 还有“究竟,到底”的含义,用于疑问词之后(Used as an intensifier after who, what, when, where, how)

用以加强语气,用在非正式文体中(intensifier used to emphasize surprise, shock, anger, disgust, etc.)

同义词"the hell; in the world"

why on earth?究竟为什么?

What on earth do you mean?你到底是什么意思?

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