论文部分内容阅读
今天,发球武器库中最常见的配备就是那种趋向音速的一发,而支持强劲一发的是狡猾多变的切削和上旋发球。
Today, the most common outfit in the service arsenal is the one that tends to speed the sonic, and the craziest ones that support the sizzling are cutting and turning cunning.