名词
中文翻译：缩口端
同义词：
['tapered section', 'tapered edge']
例句：
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1.The car's engine was designed with a taper to improve efficiency.
这辆车的发动机设计有缩口，以提高效率。
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2. The tapered end of the pipe allows for easy insertion into the socket.
管道的缩口端便于插入插座。
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3. The tapered end of the wrench is designed to fit tightly around the bolt.
扳手的缩口端设计用来紧固螺栓。