She says many students are sleepy and unable to pay attention in class because there is not enough food for them at home.

VOA: special.2009.08.24

During the war the government needs resources; it's in trouble; it raises taxes to try to pay for the war but then it finds it unable to collect taxes well.

在战争期间，政府需要资源；,它处于困境之中；,它通过提高税收来为战争支付开销,但是它又会发现自己不能够很好的得到税收资金。

耶鲁公开课 - 金融市场课程节选

Spain's debt totals more than Although its economy is far larger, investors fear that Spain, like Greece, might soon be unable to pay its creditors.

VOA: standard.2010.06.24

President Obama said the current system has led the country to a breaking point, imposing hardships on middle-class Americans who struggle to pay for health care, who are unable to obtain it.

VOA: standard.2009.09.10