line of business

• In my former line of business , i dealt with cash
  我以前干活，就认钱
• We specialize in this line of business
  我们专门经营此项服务。
• What line of business are you in
  你们主要从事哪方面的行业？
• The export of textiles is our line of business ( or : our business scope )
  出口纺织品是我们的经营范围。
• Your company is the largest and best one in this line of business
  贵公司在这一行里是最大最好的公司。
• The export of textiles is our line of business ( or : our business scope )
  出口纺织品是我们的经营范围。
• In what lines of business you would like to participate in with us
  你们准备和我们合资经营哪方面的业务
• A : your company is the largest and best one in this line of business
  贵公司在这一行里是最大最好的公司。
• For the hkmc , the product will open a new line of business
  对按揭证券公司来说，这项产品能为公司开拓一项新业务。
• What line of business are you in
  你做那一行