副词
中文翻译：曾经的
同义词：
['formerly', 'previously', 'formerly例句：1. He was a famous writer', 'but he erstwhile was just an ordinary man.（他曾经是一位著名的作家，但以前只是一个普通人。）']
例句：
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1. He was a famous writer, but he erstwhile was just an ordinary man.
他曾经是一位著名的作家，但以前只是一个普通人。
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2.The old house is still standing, though it's been erstwhile inhabited for years.
这座老房子仍然屹立着，尽管它已经荒废多年了。
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3. She erstwhile worked as a teacher before she became a writer.
她曾经是一名教师，后来成为了一名作家。