他们还强调了避免表面比较和“升降机经济学”(elevator economics)的重要性，“升降机经济学”强调不同时间和不同国家间的微小差异。
They also say the importance of avoiding superficial comparisons and "elevator economics" that stress small differences over time and across countries.
我测试的时间，虽然我的车是完美的比较，有一些在表面的抓地力。
I compare with testing time and although my car is perfect, there is little grip in the surface.
目的本实验用显微硬度测量法，定量研究和评估人离体牙釉质在酸性饮料中的硬度变化，比较牙釉质在饮料中浸泡时间及浸泡频率对釉质表面硬度的影响。
Objective This in vitro study quantitatively assessed the effect of frequency and time span of immersion of human teeth in acidic soft drinks on enamel surface microhardness.
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