The Open-Close Principle.

开发—封闭原则。

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When referring to the classes Open Close Principle can be ensured by use of Abstract classes and concrete classes for implementing their behavior.

当提及类的打开关闭原则，它可以通过抽象类和实体类实现行为的方式来确保。

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Then, chose acetone, ethyl acetate, xylene and dimethylformamide according to solubility parameter close principle as solvents to dissolve coating finishing agents.

然后利用相似相溶原理选择了四种有机溶剂进行剥离实验：丙酮、二甲苯、二甲基甲酰胺及乙酸乙酯。

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Mr Dunne said he was not against the plans "in principle" to close eight police stations in his constituency and replace them with "community offices" in places like shopping centres.

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IAG, the parent company of British Airways and Iberia, said this morning it had reached agreement in principle to buy bmi, and expected to close the deal early next year.

ECONOMIST: Business travel