Check that the cup it is perfectly clean and dry. Apply a small amount of grease to the piston and end seals to facilitate easy assembly of the cup.是什么意思_Check that the cup it is perfectly clean and dry. Apply a small amount of grease to the piston and end seals to facilitate easy assembly of the cup.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句