名词
中文翻译：换挡装置单元
同义词：
['change gear unit', "gear change unit例句：1. The car's engine is designed to have multiple gear changes for better efficiency.（这辆车的发动机设计有多个档位，以提高效率。）"]
例句：
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1. The car's engine is designed to have multiple gear changes for better efficiency.
这辆车的发动机设计有多个档位，以提高效率。
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2.The mechanic changed the gear unit on the transmission.
机械师更换了变速器上的换挡装置。
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3.The engineer tested the changing gear unit of the machine before it was put into operation.
工程师在机器投入运行前测试了其换挡装置。