各中央银行（或美国主要的政府主办贷款银行—美国联邦国民抵押贷款协会Fannie Mae）购入抵押贷款支持证券以增加市场的流动性可能会起到一些作用。
It may make sense for central banks (or Fannie Mae, America’s major government-sponsored mortgage company) to buy mortgage-backed securities in order to help provide market liquidity.