Base running 跑垒员
In baseball, base running is the act of running around the bases performed by members of the team at bat.
In general, base running is a tactical part of the game with the goal of eventually reaching home to score a run. The goal of batting is generally to produce base runners, or help move base runners along. Runners on second or third base are considered to be in scoring position since a normal hit, even a single, will often score them. Part of the goal of a runner and a batter is to get the runner into scoring position.