名词短语
中文翻译：包围的后部齿轮
同义词：
['Enclosed rear gear', 'Enclosed rear gearbox', 'Enclosed rear gear assembly']
例句：
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1. The car's engine is encased in a heavy steel box to protect it from damage.
这辆车的发动机被一个厚重的钢制盒子包围，以保护它免受损坏。
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2.The new design of the gearbox has made the transmission smoother and more efficient.
新型变速箱的设计使传动更加平滑高效。
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3. The rear gearbox is designed to be easily removed for maintenance.
后部齿轮箱设计为便于拆卸进行维护。