As to same tea age, the population of azotobacter became smaller with the soil fertility decrease.

相同茶龄的土壤中固氮菌的数量随土壤肥力的降低而减少；

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The prevalence of CHD among overweight people with hypertension and hyperlipidemia was 7.48 times ( 95% CI : 4.94-11.34 ) that of the same age healthy population.

超重肥胖伴有高血压、高血脂者患冠心病的危险性是同龄健康者的7.48倍（95%CI：4.94~11.34）。

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