短语
中文翻译：一旦不
同义词：
['once upon a time', 'if only', 'once in a while']
例句：
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1. She wasso excited that she couldn't wait to tell everyone about it.
她太兴奋了，迫不及待地要告诉每个人。
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2.If only we could have met each other sooner.
如果我们能早点遇见就好了。
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3. Once in a while, I like to go for a bike ride in the park.
偶尔，我喜欢去公园骑自行车。