Still, distribution remains McKesson's backbone: A full one-third of all medicines used in the U.S. run through its pipeline.
销售网络是它的支柱：美国市场上使用的多达三分之一的药品都是通过它的销售网络销售的。
The Second West-East gas pipeline, when completed, will be connected to more than ten established pipelines in China, and will be a backbone of guarantee in China's oil and gas pipeline system.
西气东输二线全线建成后，将与中国十几条已建成管道相连，在中国油气管网体系中发挥骨干管线的保障作用。
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