基本解释弹簧柱塞英汉例句双语例句V-packings: Self-adjusting, spring-loaded, double V-packings maintain constant high pressure seal compression and extend seal and plunger life.密封：自动调节，弹簧底座，双层V-密封维持高压密封和延长密封与柱塞寿命。spring-loaded plunger更多例句专业释义经济学弹簧柱塞