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。

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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。

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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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Asking digital readers to pony up for essays, journalism and poems is no longer a fringe proposition, as major media outlets are embracing digital-subscription models.

WSJ: Pushing Editorial Into World of Apps

With previous mega-mergers, it has been the state regulators that have been the deciding factor a proposition that has derailed some major deals.

FORBES: Duke Energy Screws Up But it Can Recover

The Church of Jesus Christ of Latter-day Saints has been a major player in organizing and funding a proposition to outlaw same-sex marriage in California.

NPR: Mormons Divided On Same-Sex Marriage Issue