名词
中文翻译：头部间隙
同义词：
['headroom', 'clearance height', 'clearance width']
例句：
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1. The car needs to have a head clearance of at least 20 centimeters to pass through the narrowestpoint.
这辆车需要至少有20厘米的头部间隙才能通过最狭窄的地方。
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2. The engineer calculated the clearance for the new machine to ensure it could operate safely.
工程师计算了新机器的间隙，以确保它可以安全运行。
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3. The manufacturer has increased the clearance between the gears to improve efficiency.
制造商已经提高了齿轮之间的间隙，以提高效率。