1. 一垒：棒球场设有四个垒(bases):一垒(first base)、二垒(second base)、三垒(third base)、本垒(home base). 球员击球之后,必须跑遍相隔颇远的一、二、三垒,而且他的脚或者其他部位必须接触及每一个base,才能得分. 现在,

2. 一塁：ファースト first 一垒手 | ファースト?ベース first base 一塁 | ファアボール four ball 四個壊球

3. 一垒的位置：first and foremost 首先 | first base 一垒的位置 | first baseman 一垒手

4. 一垒的：home base 本垒的 | first base 一垒的 | second base 二垒的

noun

1. the initial stage in accomplishing something

e.g. we didn't get to first base with that approach

2. the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate)

Synonym: first

3. the base that must be touched first by a base runner in baseball