名词中文翻译1
中文翻译：Unknown
同义词：
['effective diameter', 'useful size例句：1. The new machine has a useful diameter of 50 cm.（这台新机器的有用直径为50厘米。）2. The drill bit is designed to have a useful diameter of 1 mm.（钻头的设计尺寸是具有1毫米的有效直径。）3. The pipe was cut to the required useful diameter for easy installation.（管道被切割到所需的有效直径，以便容易安装。）']
例句：
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1. The new machine has a useful diameter of 50 cm.
这台新机器的有用直径为50厘米。
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2. The drill bit is designed to have a useful diameter of 1 mm.
钻头的设计尺寸是具有1毫米的有效直径。
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3. The pipe was cut to the required useful diameter for easy installation.
管道被切割到所需的有效直径，以便容易安装。