That has helped ZTO maintain profit margins as prices charged to customers decline.
这帮助中通在降低面向顾客的收费同时仍能维持利润空间。
ZTO is one of four Chinese delivery companies that ferry a bit more than half of all packages in China.
中国的四家快递公司承担了该国略超过一半的包裹，中通便是其中之一。
The diameter of ZTO-NP can satisfy the requirement of liver target, and meets the requirement of task design.
制得的ZTO-NP粒径已能满足肝脏靶向的要求，达到了课题设计的要求。
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