Wǒ bù dǒnɡ.
我不懂。
I don't understand it.
Notes:
我(wǒ): I
不(bù): not
懂(dǒnɡ): understand
Example:
A:你懂吗?
     Nǐ dǒnɡ mɑ?
     Do you understand?
B:我不懂。
     Wǒ bù dǒnɡ.
     I don't understand.
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