TA的每日心情 | 慵懒
2018-11-21 09:39 |
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签到天数: 69 天 [LV.6]常住居民II
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本帖最后由 enti 于 2019-1-4 04:55 编辑
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0 z1 ]* G" f' zThis required uranium, a metal, to be converted into a gas, uranium hexafluoride, that could be streamed through the barrier, its surface designed to allow U-235 to pass through more readily. But to make uranium hexafluoride required combining uranium with the element that most chemists still feared: fluorine. And with no practical way to contain either fluorine or uranium hexafluoride, which was also as dangerous and reactive, the undertaking seemed like a long shot. Even Urey was skeptical. In short, what he needed was a class of never-built-before materials made to suit the harshest industrial environment yet conceived, and produced at a scale thought unfathomable.4 \7 @' I# S* X5 f$ U
8 J6 T" _4 k% F１． ｙｅｔ 这里是哪种意思？ 1 z4 @' u3 k) S. l$ ~7 [& V
-- 修饰harshest？
0 U. C# U; H' L o$ M% I -- 修饰conceived？
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: E/ h% |+ ?2 M% n$ G2 ． ｐｒｏｄｕｃｅｄ ａｔ ａ ｓｃａｌｅ 是什么意思？( y% Y8 ^* W; f0 Y4 B
-- 修饰 ｍａｔｅｒｉａｌ 而不是 ｅｎｖｉｒｏｎｍｅｎｔ 是因为那个逗号么？9 J+ M: f4 w" r7 S
-- 这种材料能（在数量上）大规模生产（数量） / 这种材料能（在各种环境下）大范围生产？ |
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发表于 2019-1-4 04:40:28
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