Wǒ kǎolǜ kǎolǜ.
我考虑考虑。
Let me think about it.
Notes:
我(wǒ): I
考虑(kǎolǜ): to think about
Example:
A:先生,你要买这辆法拉利吗?
Xiānshenɡ,nǐ yào mǎi zhè liànɡ Fǎlālì mɑ?
Mr, do you want to buy this Farrari?
B:我考虑考虑。
Wǒ kǎolǜ kǎolǜ.
Let me think about it.