专四100条阅读难句：sentence 8

　　As we have seen, the focus of medical care in our society has been shifting from curing disease to preventing disease-especially in terms of changing our many unhealthy behaviors, such as poor eating habits, smoking, and failure to exercise. (06.12 Passage 2)

　　主干：the focus has been shifting

　　1. 句首As引导非限制性定语从句，As指代主句所说的内容，在从句中作seen的宾语。

　　2. 主句中破折号后的内容是短语介词in terms of引导的介词短语作状语，表示“从......方面来说”，changing与前面的shifting构成语义再现。

　　译文：正如我们所看到的一样，我们社会医疗的重心正在从治疗疾病转到预防疾病上来---特别是要改变我们许多不健康的行为，比如说不良的饮食习惯、抽烟、忽视锻炼。