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Class hierarchy showing violation of Open Closed principle.
违反开发闭合原则的类结构。
youdao
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Class closed. Mr. Smith is sick today. Please accept our apologies.
本班级的课暂停。史密斯先生今天生病。请接受我们的道歉。
youdao
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Class closed. Mr. Smith is sick today. Please accept our apologies.
本班级的课暂停。史密斯先生今天生病。请接受我们的道歉。
youdao