Clinical materials include: gender, age, operation type, body weight, maximal flow and number of death.

记录临床资料包括：性别、年龄、手术类型、体重、体外循环最大流量和死亡例数。

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The results show that soil and water conservation forest gives its maximal benefit after definite age.

研究结果表明，水土保持林要达到一定的年龄才能发挥其最大的水保效益。

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