名词
中文翻译：有效直径
同义词：
['efficient diameter', 'effective radius']
例句：
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1.The new machine has a much smaller effective diameter compared to the old one.
新机器的有效直径与旧机器相比要小得多。
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2.The project's effectiveness is measured by its effective diameter.
项目的有效性通过其有效直径来衡量。
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3. The company's effective diameter has increased significantly since it was established.
自从公司成立以来，其有效直径显著增加。