across room还是through room

across room还是through room The waiter shouted the room.空白部分使用through还是across swim ( )填across还是through fly across the room 为什么不是fly through the room across the room 还是throngh the room? 穿过窗户前面用across还是through, “穿过森林”应该用through还是across 穿过桥用across还是through? 过河是go through还是go across 穿过桥用through还是across 游泳swim应该用across还是through 穿越沙漠用across还是through 穿过沙漠用through还是across 穿过沙漠是用across还是through? 是swimming through 还是swimming across? through 和across的用法要用across the forest 还是through the forest?trek across 还是trek through 为什么要用“across the room而不用through the room?RT 穿过人群用across还是through我认为是through 但是有人说是across