【GRE：核心词组之be,premised,on】behappy怎么解释

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be premised on 以……为前提
　　释义
　　If the conclusion is premised on an assumption, it is true when the assumption is correct.
　　例句
　　The plan is premised on continuing abundant profits.
　　GRE
　　Research should certainly continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has proven practical.
　　关于可控核聚变的研究当然应该继续，但是在它的实用性被证明之前，不能仅仅因其存在就开展相关能源项目。