If someone is detained because they appear ill, a medical expert from the Centers for Disease Control and Prevention comes to the scene to check them and, if necessary, send them back over the border.

VOA: standard.2009.04.30

You have discribed the border as a safe where things the Taliban just go over there, when they are chased by the Afghan troops and Nato and then they come back then things are a little bit cooler.

您把这个边境线描写成一个关卡,当塔利班分子被阿富汗和北约军队追击时，他们就越过边界线,风声不紧时，他们又通过这个关卡回来。

普林斯顿公开课 - 国际座谈会课程节选

Over the Canadian border it makes its way into the Richelieu River in Quebec.

VOA: special.2009.01.05

The Obama administration has dispatched some 500 additional federal agents to the U.S.-Mexico border to stop the violence from spilling over into the United States.

VOA: standard.2009.03.26

The increased violence is spilling over into many U.S.border towns, including Nogales,Arizona.

VOA: standard.2010.04.21

The recent killing of three people with ties to the U.S.consulate in Juarez,Mexico, and the shooting death of a popular rancher on his property in Arizona, are increasing the anger over drug-related violence on both sides of the U.S.-Mexican border.

VOA: standard.2010.04.21