迄今，封面球星一直是乌塞恩·博尔特和弗朗姬·德托里。

Cover stars so far have been Usain Bolt and Frankie Dettorri.

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雷纳和他在新泽西州普林斯顿大学的同事弗朗斯·普里托里厄斯(Frans Pretorius)用计算机模拟来研究黑弦是如何运行的。

Lehner and colleague Frans Pretorius of Princeton University in New Jersey used a computer simulation to study how black strings would behave.

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