名词
中文翻译：花键
同义词：
['spline', 'spline connection', 'spline slot']
例句：
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1. The engineer used a spline to connect the gears together.
工程师使用花键将齿轮连接在一起。
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2.The machine has a spline slot for easy adjustment of the parts.
这台机器有一个花键槽，方便调整部件。
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3.The spline was designed to fit perfectly into the hole in the gearbox.
花键设计得可以完美地插入齿轮箱的孔中。