求翻译：　　国际项目因大小、种类、周期及所用材料的不同，均不同程度的存在材料及使用时间的配套风险。所以采购部在得到计划后，还要考虑不同材料使用顺序和品种配套问题。采购部门应提前与各相关部门共同分析研究，根据上下游工程材料的接口关系，分清轻重缓急，合理衔接，统筹规划，保证施工过程中所需配套材料的及时到位以及所购材料的充分使用，避免造成材料积压或断档，减少项目成本。是什么意思？

　　International project because of its size, type, cycle and use of different materials, different degrees of risk time supporting existing materials and use. So purchasing department after being planned, also consider using matching problems of order and variety of different materials. Analysis of the Purchasing Department should advance with the relevant departments to study, according to the downstream interface of engineering materials, set priorities and reasonable convergence, overall planning, guarantee the required supporting material in the construction process in place in time and the full use of the purchased material to avoid backlogs or be out of stock of materials, reduced project costs.