In shiprepair and shipbuilding line ,derusting of ships structure and hull adopts traditional ways like hand chipping, scraping and pneumatic sand blasting, the shortcoming is that they pollute the environment severely.是什么意思_In shiprepair and shipbuilding line ,derusting of ships structure and hull adopts traditional ways like hand chipping, scraping and pneumatic sand blasting, the shortcoming is that they pollute the environment severely.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句