英语词汇“boron”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	boron
释义	Word Frequency boron (ˈbɔːrɒn) noun a very hard almost colourless crystalline metalloid element that in impure form exists as a brown amorphous powder. It occurs principally in borax and is used in hardening steel. The naturally occurring isotope boron-10 is used in nuclear control rods and neutron detection instruments. Symbol:B; atomic no: 5; atomic wt: 10.81; valency: 3; relative density: 2.34 (crystalline), 2.37 (amorphous); melting pt: 2092°C; boiling pt: 4002°C Word origin C19: from bor(ax) + (carb)on
随便看	browless brown brown ale brown algae brown bag brown bagged brown bagging brown-bagging brown bear brown belt brown bread brown bullhead brown coal brown cow brown creeper brown dwarf Browne brown earth browned-off browned off brownface brown fat brownfield brownfield site brown flour

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