英语语法分析

JUST two months ago spectators at the Cincinnati Masters, one of the world's biggest tennis tournaments outside the grand slams, may have witnessed the most explosive groundstroke ever.

两个月前，在辛辛那提大师赛上——除四大满贯赛以外最重要的网球循环赛，观众们亲眼见证了史上最具爆发力的落地击球。