名词
中文翻译：封闭环
同义词：
['closed loop', 'sealed ring例句：1. The closed ring on the door is a safety feature.（门上的这个封闭环是一个安全特性。）']
例句：
-
1. The closed ring on the door is a safety feature.
门上的这个封闭环是一个安全特性。
-
2.The engineer found a closed ring in the circuit board.
工程师在电路板上发现了一个封闭环。
-
3.The closed ring was used to secure the bolts together.
这个封闭环被用来将螺栓固定在一起。