living snail mean density
living snail mean density
活蜗牛平均密度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The snail habitat area, mean density of living snails and prevalence of schistosomiasis in human and cattle were compared with those of the control villages.
观察钉螺孳生面积、活螺平均密度及人畜感染率变化情况，并与对照组（龙湾镇竺场村）比较。
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