sources

例句:

• Groups also seek out the same sources of food.
  来自BBC
• Butter, margarine, and oily fish are all good sources of vitamin D.
  黄油、人造黄油和多脂鱼都含有丰富的维生素D。
  
• I don't have any sources on this savings.
  来自SA
• So I wonder what sources they are drawing on.
  来自SA
• Interfering in-laws are the prime sources of the blues.
  喜欢指手画脚的姻亲最让人头疼。
  
• Renewable sources of energy must be used where practical.
  必须在可行的地方使用可再生能源。