fly across the room 为什么不是fly through the room

为什么要用“across the room"而不用"through the room"? fly through the air 两道英语是非题fly across the sky 还是 fly through the skyThe plane is across room还是through room across the room 还是throngh the room? The waiter shouted the room.空白部分使用through还是across It's cold outside,but it's (w--)in the room.I sometimes fly There are some___(fly)in the room填写适当形式,以及原因 There are too many____(fly)in the room and I don't want to s fly over the river ,fly across the river ,walk over the brid the children like watching planes fly through the air 中为什么同时 who was thrown across the room