تفاوت دو کلمه

 The differences between through &across.

Both describe transitions, but "across" is related to traversal, "through" is related to penetration, going into something.
Using across and through is similar to the difference between on and in.

I am walking across the desert. ( I am on the desert ).

I am driving through the tuel. ( I am in the tuel ).
Her are some examples:
1. Yesterday it was so warm. We walked with our dogs through the garden.
2. It's the second time we have flown across the Atlantic.
3. I saw your sister walking across the street. She was all alone.
4. I suppose the burglars got in through an open window.
5. This man swam across the Atlantic in 1930.
6. Don't go through the forest when you are alone.
7. He was watching her through the bedroom window.
8. He probably swam across the river in a few minutes.
9. I've lost my keys. I'll have to climb in through the window.
10. I saw this terrible accident when I was driving through the tuel.