美国一度曾经是大英帝国的一部分。

Empire the United States was once a part of the British Empire.

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雅虎一度曾经引入类似服务，但仍落后于Facebook。

Yahoo! Introduced similar features some time ago, yet still lags Facebook.

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一度曾经希望土耳其仅成为欧盟“特定合作伙伴关系国”而不是“成员国”的默克尔，也改变了她的口风，同时暗示土耳其应当可以获得成员国身份。

Ms Merkel, who once backed only a "privileged partnership" for Turkey that fell short of full membership, changed her tune and suggested that membership may be attainable after all.

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open it up much later. Because they used to open it more earlier, much more earlier,

它的开放时间一度曾被延后。因为公园曾经的开放时间要早得多，

河滨公园 - SpeakingMax英语口语达人