为什么要用“across the room"而不用"through the room"?RT

为什么过桥要用go across the bridge,across不是横穿吗? He swam across the river last year.为什么用across The view is common across all the neighborhood.这里为什么用across 为什么要用“across the room而不用through the room?RT the clouds rolled across the sky为什么要用ROLL呢? I can swim across the river.为什么用across而不是cross? through 和across的用法要用across the forest 还是through the forest?trek across 还是trek through march across the park为什么用across?march across the park选自初二下册英语书第二单元Reading,为什么不用march through the park? walk _____ the gates用through还是 across?为什么 Be careful when you go across the bridge.说明一下为什么要用careful和across这是个新课堂的题 现在速求 he walked across the hall to his bedroom 句子的中across不是指穿过物体表面吗?穿过大厅应该是穿过物体的内部啊?为什么要用across cross the bridge across the finishing line 为什么一个用cross 一个用aross写错了，aross应为across The dog's running across the grass.狗在草地上跑,为什么要加across?3Q 解释两个单词He carried the baby across the busy roads. 为什么用across?busy在这里是什么意思? do you mustn't go across the road when the light is red?怎么翻译?为什么要用mustn't? 填空：He often help old people_________(across) the street.这里的是用（to ）across ,还是用acrossing?为什么?很不好意思，应该是cross，而不是across。 用across the street造句 ____the street and you will see the hospital.用go across 还是 cross?为什么?go across与 cross的区别