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 proposition that must follow from the major and minor premises in a syllogism.
伴随三段论的大前提和小前提必然得到的命题。
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。
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。
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