n.弹簧安全阀 spring loaded safety valve: 弹簧安侠工spring-loaded safety valve: 弹簧式安全阀direct spring loaded safety valve: 弹簧式安全阀sealed spring loaded safety valve: 封闭式弹簧安全阀exposed spring type safety valve: 弹簧外露式安全阀下载手机词典可随时随地查词查翻译