SE的中文意思、音标与词形变化

[计] 栈空, 系统扩充 [医] 硒(34号元素)

n a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) n the compass point midway between south and east; at 135 degrees