merchant banking
noun /ˌmɜːtʃənt ˈbæŋkɪŋ/
  /ˌmɜːrtʃənt ˈbæŋkɪŋ/
(British English) (also investment banking)
 [uncountable]- the business activity of banks that deal with large businesses, helping with buying and selling large numbers of shares in different companies商业银行:与大型企业打交道的银行的商业活动,有助于买卖不同公司的大量股份