它们很脆弱。” 许敏说，她是文章的合著者，也是费英堡学院的研究助理教授。
They're very fragile and delicate, " said Min Xu, a paper coauthor and research assistant professor at the Feinberg School.
这位马约卡人（纳达尔）赢得了自己在全英网球俱乐部的第一顶桂冠，并阻碍了费德勒争夺“五连冠”的进程。
The Mallorcan won his first crown of the All England Club and halted Federer's run to five consecutive titles in the process.
去年纳达尔和费德勒鏖战了将近5个小时，双方都勇猛无比，最终西班牙人结束了瑞士人在全英俱乐部的统治。
Nadal and Federer battled for nearly five hours, braving the conditions and each other, before the Spaniard finally ended the Swiss 'reign at the all England Club.
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