比例
word A2- proportion
- scale
Its characters
Words with it
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随着医疗条件的改善和人均寿命的延长，老年人在总人口中所占的比例日益提高，我们正在步入老龄化社会。
研究者对河姆渡附近的田螺山遗址进行了统计，结果发现，在几百年的时间里，不落粒的稻子所占的比例只是缓慢地上升。
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