attachment

noun [具体名词]附加设备，附属物；（邮件）附件；文件附件；喜欢，依恋；（临时的）隶属，委派；信念，拥护；连接，连接物；扣押

An attachment is a device that can be fixed onto a machine in order to enable it to do different jobs.
(机器的) 附加装置 •  Some models come with attachments for dusting.  一些模型带有附加的除尘装置。