| 释义 |
〔payback〕"One problem with space ventures is that the up-front costs are enormous and the paybacks uncertain and far off at best"(Eric Gelman)“太空事业的一大问题是，付出巨大的代价，但是回报却是未卜的或远不尽人意”(埃里克·盖尔曼)〔incalculable〕Impossible to foresee; unpredictable:无法预知的；未卜的： |