Sorry, I can't give you the answer right off the bat.

抱歉，我现在无法立即答复你。

1.(Right) off the bat：立刻；毫不犹豫。

例如：The teacher said that he could not think of the title of the book right off the bat.（老师说，他一时想不起那本书的名了。）

2.Bat：球棒，球拍，蝙蝠。

【相关词组】

(as) blind as a bat 看不清的；不易看清的；看不见的（别人却看得见的）
Off your own bat 自觉地；主动地