Boron

['bɔːrɒn] or ['borɑn]

解释:

(noun.) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder.

约瑟夫编辑--From WordNet

解释:

(n.) A nonmetallic element occurring abundantly in borax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10.9. Symbol B.

录入:罗兰

解释:

n. a simple non-metallic element present in borax and boracic acid obtained in crystals which resemble diamonds.

厄玛编辑