pronates

1. I suspect (but can`t tell without high-speed video) that he pronates hard through release to get the great sink he does on his fastball/changeup combinations, and I also think his slider is safer than most for the same reason.
    我有点怀疑王建民出手时手掌用力向下（但这要靠高速影片才能分析），藉此让快速球或变速球获得极佳的下沈幅度。同样的理由，我认为他的滑球会比较「安全」。

2. An individual who neutrally pronates initially strikes the ground on the lateral side of the heel.
    一个人正常跑步时首先是后跟外侧触地。