Rooftops near any protrusions (ie stairwells). Protruding stairwells, air vents, etc can be used as cover for anyone using a roof as a firing position.

• 靠近任何突出物的屋顶（包括楼梯井）。突出来的楼梯井和通风口等等，可以被任何利用屋顶做为射击点的人当作掩体。