In matches lasting more than two days the captain usually has the option of taking another new ball after a set number of overs (usually 80) have taken place since a new ball was introduced (an innings always begins with a new ball).
在持续超过两天的比赛中,队长通常在进行一系列的轮数之后（通常是80轮）可以选择新球，自从引进新球以来（一局总是以一个新球开始）。