从天然的异质群体中选择优良个体，进而培育成新品种的方法。
Heterogeneous groups from natural selection fine individual, and then fostered into a new variety of methods.
大学生作为一个特殊的知识群体，他们的道德水平发铺状况也天然而然地备受人们关注。
University students are a special group with deeply knowledge, whose moral development has been naturally concerned by people.
结论这种私自开采铀矿已造成了被污染环境生活群体的剂量大大超过天然辐射本底的正常水平，应予以关注。
Conclusion Illegal uranium mining had brought about the fact that the annual effective dose of the inhabitants who lived in contaminated environment was makedly high above the normal level.
结论这种私自开采铀矿已造成了被污染环境生活群体的剂量大大超过天然辐射本底的正常水平，应予以关注。
Conclusion Illegal uranium mining had brought about the fact that the annual effective dose of the inhabitants who lived in contaminated environment was makedly high above the normal level.
应用推荐