ballgame
noun [ C ] mainly US uk/ˈbɔːl.ɡeɪm/ us/ˈbɑːl.ɡeɪm/
棒球比赛
a baseball game
Idiom
a whole new ballgameidiom 完全不同的情况，完全是另一回事儿（尤指难事或自己知之甚少的事情）
a completely different situation, often one that is difficult or that you know little about
We'd done a lot of climbing in Scotland but the Himalayas were a whole new ballgame. 我们之前在苏格兰登过不少山，但攀登喜马拉雅山则完全是另一回事儿。