例句：
有人曾經(jīng)認為鉛可以變成黃金。
It was once thought that lead could be transmuted into gold.
人們曾經(jīng)認為地球是平的。
People used to think the earth was flat.
我曾經(jīng)在倫敦居住過。
I used to live in London.
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2021-09-14
例句：
有人曾經(jīng)認為鉛可以變成黃金。
It was once thought that lead could be transmuted into gold.
人們曾經(jīng)認為地球是平的。
People used to think the earth was flat.
我曾經(jīng)在倫敦居住過。
I used to live in London.