美语听力练习素材:"洞察号"登陆火星

1.A NASA unmanned spacecraft is set to land on Mars on Monday after a 6-month voyage.

unmanned无人的

The balloons would be used to transport equipment on unmanned missions.
气球在无人的任务会被用来当作运输设备。

2.US border agents in San Diego fired tear gas as migrants in Mexico tried to breach the border fence after a protest.

breach破坏

The bomber had breached security by hurling his dynamite from a roof overlooking the building.
爆破手从一个俯瞰这幢楼房的屋顶上投掷了炸药,攻破了安全防卫。