英语语法分析

Rubies, valued as precious gems, are the mineral corundum in its red form.

作为一种珍贵的宝石，红宝石是一种红色的矿物刚玉。

Moreover, corundum and periclase have not been detected in space dust before.

而且，此前在太空尘埃中还未侦测到刚玉和方镁石。

Relating to or designating corundum that resembles another stone in color.

关于或表示在颜色上类似另一块石头的刚玉的。