ditto  adv spoken informal 【口，非正式】1. used to say that you have exactly the same opinion as someone else 我也一样：“I hated school.”“Ditto.”“我讨厌上学。”“我也一样。” 2. Where should she go? Mississippi? too hot. Ditto Alabama. 她应该去哪里？密西西比州？太热了。亚拉巴马州也一样。（摘自《朗文高级英语应试词典》p.659）

 ditto at golf 不是一个句子，在副词前面不需要用连词：He is good at baseball, ditto at golf. 他擅长棒球，同样也精于高尔夫球。（摘自《韦氏高阶英汉双解词典》p.626）

    He is good at baseball, ditto at golf.

    =  He is good at baseball and (he) is also good at golf.

    =  He is good at baseball and  golf.