The under cut form of the first two undercut sprue pullers, discussed above--re machining problems, particularly with respect to large mould plates.是什么意思_The under cut form of the first two undercut sprue pullers, discussed above--re machining problems, particularly with respect to large mould plates.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句