ask me another 我说不上来；我不知道；我怎么知道

【例句】

"Do you know the answer to this question? " "Ask me another. "
“你知道这个问题的答案吗？”“我不知道。”

Ask me another. He's had two or three different girl friends recently.
我说不上来，最近他又交了两三个女朋友。