锆锡合金形成第二道防护，把放射燃料跟反应堆其他的组成分隔开。
The Zircaloy casing is the second barrier to release that separates the radioactive fuel from the rest of the reactor.
这可能是因为月球形成过程中，撞击产生的热能使挥发性氢元素——水的重要组成成分——大量流失。
That could be because the collision that made the moon in the first place was so hot that volatile elements like hydrogen, a key component of H2O, largely burned away.
分析了不同形状的立窑熟料的成分、矿物组成及形成条件。
The composition of clinker from shaft kilns, the mineral substances as well as forming conditions were analyzed.
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