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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' C) V% Y+ d: e' mThis 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.) [: z- \' x& @8 ^5 b+ @2 j3 Q5 A& U: M* D
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1. yet 这里是哪种意思? % Y& U! C# ?# _( i& O
-- 修饰harshest?9 R5 r9 |* Y& i, U' J* h q
-- 修饰conceived?/ f# Y& c& p) n/ I/ o R! }9 R) E
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2 . produced at a scale 是什么意思?4 L! O# L: {6 {2 V
-- 修饰 material 而不是 environment 是因为那个逗号么?
& f$ T, P2 M# I' r -- 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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