....sorry....(maybe develop your vocabulary) 呵呵

The most important thing is to communicate in a formal manner initially. However, it can become very informal once a relationship has been built. Generally speaking though, business communication in English is formal, straight to the point and as short as possible...so quite the opposite to the way business is done in China. So my best advice is to understand formal English (maybe develop your , as well as learning industry terminology :) Feel free to message me if you would like further help or advice.