Zhuānxīn ɡōnɡzuò.
专心工作。
Keep your mind on your work. 
 
Notes:
专心(zhuānxīn): keep mind on
工作(ɡōnɡzuò): work
 
Example:
A:你昨天去酒吧了吗?
     Nǐ zuótiān qù jiǔbɑ le mɑ?
     Did you go to bar yesterday?
B:专心工作。
     Zhuānxīn ɡōnɡzuò.
     Keep your mind on work.
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