Every time one of the two batsmen on the field gets out, another batsman enters the field and has a new partnership with the batsman who did not get out. Each partnership is named by looking at the number of batters who were out before and after the partnership; for example, the partnership between the two batsmen who are on the field when only one batter on the team is out is called the "second-wicket partnership", because it happens after the team has lost 1 wicket (had 1 batter get out), but before the loss of the team's second wicket. Because of this, it rarely happens that a batter retires (leaves the field without being out) and a new batter enters the field without changing the number of the partnership.