Terms for subject Business containing Command Language

English	Chinese
an officer who has a good command of sign language	通晓聋哑手势的官员
have a good command of the working languages	熟练掌握工作语言
have three years of experience in translation or interpretation and a good command of the working languages	有三年笔译或口译工作经验，熟练掌握工作语言一种或多种