sub-

英[sʌb] 美[sʌb]
  • pref.表示“下、在下、低于、次于、副、亚、次”之义
名词 sub:
  1. a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States

  2. a submersible warship usually armed with torpedoes

动词 sub:
  1. be a substitute