金刚砂的英文：
corundum
electrolon
emery

emery bag
(磨针用的)金刚砂袋

The emery is a hard metallic substance.
金刚砂是非常坚硬的金属物质。

It is closely related to the corundum structure except that the cations are of two different types
除了阳离子是两种不同种类以外，它和刚玉构型非常接近。

The utility model relates to a corundum sieve tube used in the field of oil field and oil well production.
本实用新型涉及油田油井开采领域中用到的一种刚玉筛管。

They infiltrated behind the lines so as to annoy the emery replacements.
他们渗透敌后以便骚扰敌军的调度。

Remove the scratches on the hook point using a fine emery paper.
请用细砂纸或锉刀研磨旋梭尖的伤痕。