The section begins with a definition on the MBS and go on to analyze its functions to banks, obligors and investors with focus on the prevention and control of bank' s risks.

本部分首先对住房抵押贷款证券化进行了界定，然后分析了其对银行、借款人、投资者的功能，重点是对银行风险的防范和控制。

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The AR-15 is one of America's top-selling firearms, and has become a focus of the gun control debate after being used in a recent spate of mass shootings.

CNN: Gun store nixes Mark Kelly's AR-15 purchase

Rebel spokeman Charles Bennie told the BBC's Focus on Africa that they would soon be in control of Klay junction, on the main road to Monrovia.

BBC: Liberia declares state of emergency

But even so, the disputed line of control between the two countries is now the focus of some of the world's most powerful people: the US and Chinese presidents spoke earlier about how to contain the situation.

BBC: Yeonpyeong's displaced await Korea peace guarantee