常見例句雙語例句V-packings: Self-adjusting, spring-loaded, double V-packings maintain constant high pressure seal compression and extend seal and plunger life.密封：自動調(diào)節(jié)，彈簧底座，雙層V-密封維持高壓密封和延長密封與柱塞壽命。 返回 spring-loaded plunger