例句：

有人曾经认为铅可以变成黄金。

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

人们曾经认为地球是平的。

People used to think the earth was flat.

我曾经在伦敦居住过。

I used to live in London.

• 与元旦的作文300字
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• 笫
• 第1
• 第2
• 第3
• 笮
• 笮
• 笱
• 笳
• 笸
• 笺
• 笼
• 笼
• 笾
• 筅
• 筇
• 等1
• 等2
• 等3
• 筋
• 筌
• 筏
• 筐
• 筑
• 筑1
• 筑2
• there was no question of
• there was no question of doing
• there was no question of happening
• there was no question of sb doing sth
• there was no question of sth happening
• there was nothing else for it
• there was nothing else for it but to
• there was nothing (else) for it (but to do sth)
• there was nothing for it
• there was nothing for it but to
• there was nothing in
• there was nothing in sth
• therewith
• there you are
• there you go
• there you go again
• the rhythm method
• the Richter scale
• the right wing
• the Rig Veda
• the ripe old age
• the ripe old age of
• therm
• thermal
• thermal imaging