This issue reviewed the history of the folding-machine firstly, then, it mainly illustrated several aspects of the folding-machine, such as general structure, reconstruction tendency and maintenance.
文章首先对折页机进行了历史回顾，然后分别从折页机的一般构造、结构发展趋势、维护等几个方面对折页机进行了阐述。
This issue reviewed the history of the folding-machine firstly, then, it mainly illustrated several aspects of the folding-machine, such as general structure, reconstruction tendency and maintenance.
文章首先对折页机进行了历史回顾，然后分别从折页机的一般构造、结构发展趋势、维护等几个方面对折页机进行了阐述。
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