名词
中文翻译：Unknown
同义词：
['square', 'squared', 'squared loop']
例句：
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1. The squared loop on the key is a good indicator of its quality.
钥匙上的方形环是判断其质量的好指标。
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2. The squared loop on the door handle is a security feature.
门把手上的方形环是一种安全特性。
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3. The squared loop on the lock is easy to remove for emergency repairs.
锁上的方形环很容易拆卸，用于紧急修理。