例句：
She opened her mouth to say something.
她张开嘴要说什么。
He hardly ever opens his mouth.
他几乎从不开口。
Then he made his way to the tunnel mouth.
于是他走到隧道入口。
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2021-09-30
例句：
She opened her mouth to say something.
她张开嘴要说什么。
He hardly ever opens his mouth.
他几乎从不开口。
Then he made his way to the tunnel mouth.
于是他走到隧道入口。