这就增加了如果一个单独的订阅者通过几种不同形式购买可能被统计两次，三次或四次的可能性。

That raises the possibility that a single subscriber could be counted twice, three or four times if paying for access on several different devices.

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在对罹患不同类型肿瘤患者进行临床试验的第一阶段，研究小组在21天内用30分钟静脉输液的形式给患者施用了四次针对性纳米粒子剂量。

In a phase 1 clinical trial in patients with various types of tumors, the team gave doses of the targeted nanoparticles four times over 21 days in a 30-minute intravenous infusion.

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然而几何学告诉我们，只有二次、三次、四次和六次的旋转对称是能够存在的形式。

That is impossible. Geometry dictates that only two-, three-, four- and sixfold rotational symmetry can exist.

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