a device that shreds documents (usually in order to prevent the wrong people from reading them)
shredder详细解释
shred.der n.（名词）One that shreds.切碎机，粉碎机A device used for shredding documents, often as a security measure to prevent unapproved persons from reading them.碎纸机：用以切碎文件的机器，常用作避免未经授权的人得以阅读该文件的安全措施
