据了解，单证准备时间指报关申报之前对进出口环节所需各类单证的准备时间，是影响整体通关时间的一项主要因素，要想压缩通关时间、降低通关费用，必须减单证。
It was known that the preparation time of documents referred to the preparation time of various types of documents required for import and export before declaration, which was a major factor that affected the overall clearance time. In order to compress the clearance time and reduce the clearance costs, the documents must be reduced.