如果有价证券的价格降低，抵押的价格就会上涨，美国住房危机的规模明了的时候他们就是这么做的。

And that collateral could be increased if the securities fell in price, which they duly did as the scale of the American housing crisis became clear.

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经济衰退期间，加拿大银行削减了其基准利率(至0.25%)，注入了额外的流动资产，买下了全部的抵押借款有价证券。

During the recession the Bank of Canada cut its benchmark interest rate (to 0.25%), injected extra liquidity and bought up mortgage-backed securities.

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另外还有3万7千亿美金的基于抵押贷款并承诺返付的有价证券。

In addition, they have guaranteed repayment on $3.7 trillion worth of mortgage-backed securities they've issued.

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