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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