单词mailing-tube
网络: 邮件管；邮件盛装管
would now unpin the drawing from his board, take it into the hall and spray it with fixative, then roll it up and put it in a mailing tube.
传统画家这时要将图画从图板上取下，拿进大厅，喷定色剂。然后将它卷起来，放进邮寄用的纸筒。