difficulty in breathing on exertion是什么意思，difficulty in breathing on exertion的翻译，difficulty in breathing on exertion音标、读音、用法和例句

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difficulty in breathing on exertion是什么意思，difficulty in breathing on exertion的翻译，difficulty in breathing on exertion音标、读音、用法和例句_94生活常识网有道词典