across意為“橫穿，穿越”，強調穿過某一平面，表示運動發生在物體的表面。
The Great Wall winds its way from west to east ,across the deserts,over the mountains,through the valleys,till at last it reaches the sea.
長城從西到東，穿過沙漠，越過高山，穿過深谷，蜿蜒而行，最後到達海邊。
He can swim across the river.
他能遊過這條河。
Be careful while walking across the street .
過馬路小心點。
through意為“跨過，越過”，強調從某一空間内通過，表示運動發生在某物的空間内。
Walk through the gate ,and you'll see the rest room.
穿過大門，你就會看到洗手間。
They drove through a snowstorm.
他們驅車穿過暴風雪。
They walked through the forest.
他們穿過了森林。
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