词汇	初级发射
释义	初级发射 primary emission
随便看	spring safety link spring safety valve spring-safety valve spring sag spring salmon Springs and autumns passed unheeded spring sandstorm spring-sapping spring saturating rain springs back spring seat bearing spring seat bearing adjusting nut spring seat bearing cap spring seat cap gasket spring seat centerline spring seat center line spring-seat chair spring seating spring scale spring scales spring scale with stabilized pan spring scarificator spring scenery Spring scenery greeted the eye everywhere spring scenery in a waterside village