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.
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。
3
The "rational proposition of petty farmers and the theory of induced institutional change are the major theoretical basis of the urbanization of rural network."