基本解释彈簧柱塞英汉例句雙語例句V-packings: Self-adjusting, spring-loaded, double V-packings maintain constant high pressure seal compression and extend seal and plunger life.密封：自動調節，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。spring-loaded plunger更多例句专业释义經濟學彈簧柱塞