A grounder that rolls along the infield .

沿着界内滚动的地滚球。

In the gymnasiums of beijing and shanghai , there were grounder competitions .

上海、北京都有健身房里玩地滚球的比赛。

Wang ping : around the early 14th century , grounder began to prevail among the common .

王平:大约14世纪初德国民间就开始流行地滚球了。

The pitcher picked up the soft grounder and could easily have thrown the ball to the first baseman . Shaya would have been out and that would have ended the game .

投手接起这个轻柔的地滚球，本来他可以轻而易举地把它传给一垒手，这样沙亚就会出局，比赛也就会结束。

Grounder -- self-propelled and voice-activated model .

滚球---自走及声控模式。