名词
中文翻译：出现率
同义词：
['emergence rate', 'emergence frequency']
例句：
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1.The new drug has a high rate of success in treating cancer patients.
这种新药在治疗癌症患者方面成功率很高。
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2.The rate of unemployment in the region is increasing.
该地区的失业率正在上升。
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3. The rate of growth in the economy has slowed down recently.
最近经济增长的速度放缓了。