A block of apartments or offices is a large building containing them.
大楼 • ...a white-painted apartment block. …一幢漆成白色的公寓楼。
To block a road, channel, or pipe means to put an object across it or in it so that nothing can pass through it or along it.
堵塞; 封锁 Some students today blocked a main road that cuts through the centre of the city. 一些学生今天封锁了穿过市中心的公路。