名词
中文翻译：百分比浓度
同义词：
['percentage concentration', 'percentage concentration ratio', 'percentile concentration']
例句：
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1. The water is at a 50% concentration of salt.
水的盐度是50%。
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2. The sample has a 95% concentration of the desired element.
样本中所需元素的含量为95%。
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3. The concentration of the solution increases as more substances are added.
随着加入更多物质，溶液的浓度会增加。