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 * j1 I8 R, l* N6 O9 y
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4 W8 q! f% x* i/ ~) EThis 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.
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. g+ B+ s8 {2 J; }+ \1. yet 这里是哪种意思?
4 X9 V0 K, z7 z) y( j# Z -- 修饰harshest?1 L7 Y$ r5 z# F; T/ c8 ^" p
-- 修饰conceived?( u% {' E- E) y$ Y4 F
" j. G, j( a; k- I2 . produced at a scale 是什么意思?5 x8 b, N: ?. {( c
-- 修饰 material 而不是 environment 是因为那个逗号么?
8 Y; q# i( T5 G+ h' B -- 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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