The teacher uncovers the card at one time to teach the new word: stapler, brush and disk.
教师依次将白纸取下，讲授订书机、毛笔、磁盘三个新单词。
Polishing brush, polishing method, polishing device, manufacturing method for glass substrate for magnetic disk.
抛光刷，抛光方法，抛光装置及磁盘用玻璃基板的制造方法。
Polishing brush, polishing method, polishing device, manufacturing method for glass substrate for magnetic disk.
抛光刷，抛光方法，抛光装置及磁盘用玻璃基板的制造方法。
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