But substituting toxic battery components for gentler ones isn't always an equal energy trade-off, which is a major reason why creating "green batteries" is a tough proposition.
但是，作为其中一个替代有毒电池的成分，并不是任何时候都可以和原来的成分同等替换的。这就是创造“绿色电池”是个很棘手的问题的重要原因。
The "rational proposition of petty farmers and the theory of induced institutional change are the major theoretical basis of the urbanization of rural network."
农村“小农理性命题”和诱致性制度变迁理论是农村网络城市化的重要理论基础。
They were excluded from the major department of production. So, the proposition that men were superior to women was gradually fixed.
她们被排挤出社会生产的主要部门，由此，男尊女卑的原则逐渐被确定下来。
They were excluded from the major department of production. So, the proposition that men were superior to women was gradually fixed.
她们被排挤出社会生产的主要部门，由此，男尊女卑的原则逐渐被确定下来。
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