titanium

And, this is a really clever reaction because titanium tetrachloride is a gas.

这是一个非常巧妙的反应,因为四氯化钛是一种气体。

But for those patients who do worry about the prospect of going in for elbow surgery and coming out with a titanium hip, the final line of defense may be the most powerful: speak up.

但是对于那些确实担心为肘关节做手术结果却是换了个钛合金髋关节这一情况发生的病人，最终的防卫线或许是最有力的：大声说出来。

They indicate the titanium and iron abundance, as well as the maturity of a lunar soil.

他们能显示出月球钛和铁储量的丰富储量和其土壤的成熟度。