TA的每日心情 | 慵懒 2018-11-21 09:39 |
---|
签到天数: 69 天 [LV.6]常住居民II
|
本帖最后由 enti 于 2019-1-4 04:55 编辑 - z% l: T% g* ~; i# F' }
* g/ `8 d' v* T; }8 q) C& R% T
原文链接 |5 A# P5 s% _% \* P" d) a p6 S6 P
* z l1 @% M# h9 ^! ? W
This 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.: r0 C6 i. K" y
; T1 O- G3 V+ h4 d% w# E) i0 _3 M5 ]6 D
1. yet 这里是哪种意思?
0 ]) S2 z4 \9 V3 h$ N) N) s/ R& A8 W -- 修饰harshest?
: Y9 V U. a$ N; t' L4 c; ? -- 修饰conceived?
, g, Q) K* g8 |3 _7 t8 a$ J- y& T% g) m' r* z
2 . produced at a scale 是什么意思?4 w- S- A& y" h: n( Y
-- 修饰 material 而不是 environment 是因为那个逗号么?
/ \ w. \7 c, d D* t2 V -- 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? |
|