People used to think the earth was flat.

　　有些曾經(jīng)隨處可見的鳥類現(xiàn)在日益稀少。

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

　　有人曾經(jīng)認(rèn)為鉛可以變成黃金。

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

　　人們?cè)��?jīng)認(rèn)為太陽繞著地球轉(zhuǎn)。

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

　　我過去曾經(jīng)集郵。

　　I used to collect stamps.

　　杰米曾經(jīng)遇到過什么樣的麻煩嗎？