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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原文链接
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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.+ Z7 f# W, K% O# T/ u7 D" H# L: b
, Z3 {' x0 ]' U" N1. yet 这里是哪种意思?
$ l7 `" w r9 o2 F -- 修饰harshest?9 v7 U- V& m' Q. P8 _4 H3 z7 b1 @4 [
-- 修饰conceived?
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4 c, f# \4 b$ ^, i) s. B2 . produced at a scale 是什么意思?4 _# n9 U2 k8 C1 m, j, i% j: i/ z0 h
-- 修饰 material 而不是 environment 是因为那个逗号么?
9 g& `! d- a, h& @& U* F9 ~ -- 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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