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1.

while cropland expanding as the main driving factor of eco-environmental quality exacerbating, with the contribution ratio of 20 . 50%.

拓展耕地是恶化生态环境最主要的驱动因子，其贡献率为 20 .

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3.

This led to a 20-50% failure rate for provisioning environments .

这将导致配置环境时出现 20-50%的失败率。

4.

Symptoms range from mild to severe; 20-50% of those with severe illness will die of the disease .

症状从温和到恶性都有。20-50%的严重疾病患者将死于该病。

5.

Venture capitalists typically expect a 20-50% annual return on their investment at the time they are brought out .

风险投资者通常希望在退出时获得每年 20-50%的投资回报。

6.

and thirdly, evenly mixing 50-80% of vitrified beads and 20-50% of mixed liquid by weight percent to obtain vitrified stone paint .

按重量百分比 50~80%玻化彩珠和 20~50%混合液混合后搅拌均匀即制得玻彩石漆。