centralization and united purchase
...实际困难及其解决方案 Barriers in centralization and its solution -集中采购和联合采购 Centralization and united purchase -案例：联合采购走进食堂 Case study: United purchase in Canteen ..
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centralization and united purchase
集中统一采购
以上为机器翻译结果，长、整句建议使用 人工翻译 。