comparing time periods 比较不同时期; 比较一下时间段 extended for fixed periods of time 延长几个确定的时间
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目的：通过比较不同时期手术治疗糖尿病视网膜病变玻璃体积血的术后视力效果，探讨手术治疗的时机，并对治疗效果进行评价。
Objective: To explore the opportunity of surgery and evaluate the effect of treatment by comparing visual acuity results of different stages of surgical treatment in diabetic vitreous hemorrhage.
通过对不同时期研究点的比较，你会发现一些时期的变化要比另一些时期的更有意义。
By comparing your site at different times, you are likely to find that changes between some dates are more significant than others.
为了进行比较，你必须算入不同时期，以及不同国家之间的购买力差异。
To make the comparison, you have to account for differences in purchasing power over time, as well as between countries.
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