曾经用英语怎么说

曾经用英语可以表示为ever，once，used to do sth.等。

例句：

People used to think the earth was flat.

人们曾经认为地球是平的。

People used to think the earth was flat.

有些曾经随处可见的鸟类现在日益稀少。

Some birds which were once a common sight are now becoming rare.

有人曾经认为铅可以变成黄金。

It was once thought that lead could be transmuted into gold.

人们曾经认为太阳绕着地球转。

It was once thought that the sun travelled around the earth.

我过去曾经集邮。

I used to collect stamps.

杰米曾经遇到过什么样的麻烦吗？

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