At Harvard, the Museum of Comparative Zoology library is more frequently used and its collections are extensive so the digital age has awhile to go before it's out of date there.
在哈佛，比较生态学博物馆的图书馆使用频率要高一些。由于它的收藏丰富，数字化时代的到来，还需要有一小段的时间，因此目前它还不至于完全过时。
Of course, the division of population age structure is comparative, but not invariable.
当然，对人口年龄结构的划分是相对的，而不是一成不变的。
Methods Divided 600 patients with the same age and medical history into the observed group and the comparative group.
方法600例患者随机分为观察组和对照组，治疗前后，采用化学发光法测定血清雌二醇含量。
Methods Divided 600 patients with the same age and medical history into the observed group and the comparative group.
方法600例患者随机分为观察组和对照组，治疗前后，采用化学发光法测定血清雌二醇含量。
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