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。
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