两个deteriorate如何理解?(关于泵)? The various parts of the pump are protected prior to shipment by applying varying grades of preservative and paint. However, during shipment and handling, the preservatives are subjected to conditions that can cause their removal. Also, during extended periods of time, the preservatives may deteriorate . The following procedures should be followed to prevent deterioration of the pump during the extended storage period. 标红处如何翻译? 查看更多8个回答 . 5人已关注