名词
中文翻译：Unknown
同义词：
['past', 'past tense', 'past time', 'bygone', 'gone', 'bygone days']
例句：
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1. I'm sorry to hear that you're leaving bygone days behind.
听到你要离开，我很遗憾。
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2.The old house is still standing, but it's bygone now.
那座老房子还在，但它已经不再了。
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3.We'll never forget the bygone days of our childhood.
我们永远不会忘记我们童年的过去。