名词
中文翻译：未填充的齿轮
同义词：
['unfilled gear', "unfilled wheel例句：1. The old car's engine was a classic example of an unfilled cog.（这辆旧车的发动机是未填充齿轮的一个经典例子。）"]
例句：
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1. The old car's engine was a classic example of an unfilled cog.
这辆旧车的发动机是未填充齿轮的一个经典例子。
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2. The engineer replaced the unfilled cog with a new one to fix the problem.
工程师用一个新的未填充齿轮来修复这个问题。
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3.In the workshop, the mechanic carefully removed the unfilled cog and replaced it with a new one.
在车间里，机械师小心地移除了未填充齿轮并用一个新的来替换它。