We have carried out three sets of knee joint exposure:normal front position and two side positions, and studied in comparison with respective aluminum wedge exposure tests.

笔者就膝关节常规正、侧位进行三组曝光，并与铝梯做对应测试研究。

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"It's a really nice stage to show, at a Grand Slam, because it's tougher to beat these top guys, especially in three out of five sets, knowing after two sets they have a chance to get back, " he said.

BBC: Australian Open: Rafael Nadal overcomes Bernard Tomic