any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
例句
用作名词 (n.)
Open the rear cover of the headlamp and pull the installed halogen lamp out. 打开照明灯后盖,取出原有的卤素灯泡。
The birds were approaching, their halogen outlines flickering in the sunny air. 鸟儿接近,他们的卤素概述闪烁的阳光空气。