1. 生石灰：155 unsaturated hydrocarbon 不饱和烃 | 156 unslaked lime 生石灰 | 157 unsprinklered area [消]无喷水灭火系统的地区

2. 未消化石灰：unskilled worker 欠熟练的工人 | unslaked lime 未消化石灰 | unsound knot 活节

noun

1. a white crystalline oxide used in the production of calcium hydroxide

Synonym: calcium oxidequicklimelimecalxcalcined limefluxing limeburnt lime