机构：一级和二级创伤中心。
事实上，这里有两个贴现率，一级贴现率和二级贴现率。
Actually there are two discount rates; there's primary and secondary.
降压治疗仍是脑卒中一级预防和二级预防的重点工作。
Blood pressure reduction is most important in the primary and secondary stroke prevention.
中国石油物资供应商的管理类别包括一级采购物资供应商和二级采购物资供应商。
The management categories of CNPC's supplies include primary material suppliers and secondary material suppliers.
机构：一个一级创伤和一个二级创伤中心。
机构：一个一级创伤和一个二级创伤中心。
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