以下为句子列表：
英文: If the exhaust valve opened at BDC at the beginning of the exhaust stroke and closed at TDC at the end of the exhaust stroke, it would have a duration of 180°.
中文: 如果排气门在排气行程的下止点打开并且在这次行程的上止点关闭，它将有180°的持续。
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英文: Trade magazines are available at the TDC business InfoCentre, SME Services Stations, bookstores and newspaper stands.
中文: 以上刊物在贸易发展局商贸资讯中心、各中小企业服务站、地铁站、书店以及书报摊有售。
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