i am not meaning in Chinese
那方面我懂得不多，或者这方面我不在行，就行了
Examples
- Since i am not crazy, i do not care .
既然我没有发疯，我就毫不在乎。 - I am not getting on very fast with this job .
我这份工作进展不太快。 - I am not worthy to touch the hem of her garment .
我对她是望尘莫及。 - I am not in her good graces at the moment .
我此刻尚未讨得她的欢心。 - I am not going out with you and that is flat !
我不跟你出去，说定了。