名词
中文翻译：无环
同义词：
['null ring', 'null circle', 'void ring', 'void circle']
例句：
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1. The computer's display screen is a perfect nil ring for the user.
计算机的显示屏是用户完美的无圈。
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2. The scientist conducted an experiment to test the hypothesis that there is no nil ring in theuniverse.
科学家进行了一个实验来测试这个假设，即宇宙中不存在无圈。
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3.The engineer designed a new device that eliminates the need for a nil ring in the process of assembly.
工程师设计了一种新的设备，在装配过程中消除了对无圈的需求。