来源

• Insects need an external source of sterols .
  昆虫需要外界来源的固醇类。
• What is the origin of pelagic oozes ?
  远洋软泥的来源是什么？
• He has secret channels of information .
  他有秘密的消息来源。
• Heat gain may come from the following sources .
  热量的增加可能有下列一些来源。
• Urban areas have depended on local sources of food .
  城市地区都依靠当地的粮食来源。
• He is sometimes slipshod in handling his sources .
  他在处理资料来源时有时有点潦草。
• He was averse to revealing the sources of his information .
  他不乐意透露消息的来源。
• They are undesirable sources of their contained metals .
  它们不是所含金属的理想来源。
• Fish oil is a particularly potent source for vitamin a .
  鱼肝油是维生素A特别有效的来源。
• Peasants therefore have no source of external income .
  结果农民丧失了任何其它的收入来源。