The form the human family takes is a response to environmental pressures.
人类的家庭形式是为了应对来自生存环境的压力。
How do we find more economical, more environmental new form for metal cutting do?
我们如何寻找更经济，更环保的新形式做金属切割呢？
How do we find more economical, more environmental new form for metal cutting do?
我们如何寻找更经济，更环保的新形式做金属切割呢？
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