I talked a lot about the exam so I don't have a lot of time left to talk about the structural metals.
我说了很多关于考试的东西,所以没多少时间,讨论结构金属。
So, if we're going to go to the moon, we're going to go to Mars,we want to be able to produce oxygen, structural metals and photovoltaic materials from in situ resources.
如果我们要去月球上,我们要去火星上,我们则必须要制造,氧气,结构金属和光电材料,就在原地制造。
It's the lightest of the structural metals.
是最轻的结构金属。
Number one structural metal is steel.
第一常用的结构金属是钢。
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