third base

third-base的词性：
n.Baseball （名词）【棒球】

1. The third of the bases on the diamond counterclockwise from home plate; the last base to be reached by a runner before home plate.
第三垒：在菱形球场上由本垒逆时针数的第三个垒，选手到本垒之前的最后一垒

2. The position played by the third baseman.
第二垒：第三击球手的活动空间