名词
中文翻译：保护环
同义词：
['protective belt', 'protective sleeve', 'protective padding']
例句：
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1. The car's protective ring isdesigned to protect the driver from impact.
汽车的防护圈设计用来保护驾驶员免受撞击。
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2. The scientist used a protective ring toshield his eyes from the bright lights.
科学家用一个防护圈来遮挡他的眼睛，以免被强光刺伤。
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3. Thefirefighters wrapped the injured man ina protective ring to keep him warm.
消防员用一个防护圈将受伤的人裹住，以保持他的体温。