名词
中文翻译：双环连环
同义词：
['double link', 'double loop', 'double lock']
例句：
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1. The car was equipped with a double link system to improve fuel efficiency.
这辆车配备了一个双链系统以提高燃油效率。
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2. The double lock system on the door ensures secure access even when the key is lost.
门上的双锁系统即使在钥匙丢失的情况下也能确保安全进入。
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3. The double loop design of this belt makes it easy to adjust and comfortable to wear.
这个腰带的双环设计使得调整起来容易且穿着舒适。