The hose diaphragm piston pumps are hermetically sealed, leakproof, oscillating displacement pumps with a unique technical and economical value.是什么意思_The hose diaphragm piston pumps are hermetically sealed, leakproof, oscillating displacement pumps with a unique technical and economical value.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句