名词
中文翻译：闭壳数
同义词：
['closed-end numbers', 'closed-loop numbers']
例句：
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1.These closed-shell numbers are used to represent the number of people in a room.
这些闭壳数用于表示房间内的人数。
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2.The closed-shell numbers were used to calculate the total cost of the project.
闭壳数被用来计算项目的总成本。
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3.The closed-shell numbers were used to determine the efficiency of the machine.
闭壳数被用来确定机器的效率。