across的用法：

1. 表「橫越；由一邊到另一邊」。

We will have to swim across the river.

We had to stop because there was a tree across the road.

2. 表「在…的對面」。

There is a grocery store across (from) the drug store.

3. 表「遍佈…」。

The insurance company has more than 50 offices across Asia.

The movie became popular across the world.

4. 表「牽涉到…、關於…」，此時意義接近about。

The figures show that across the economy there has been a steady growth.

5. across-the-board adj. 全面的；包括一切的

The initiative(計畫) has across-the-board support.

6. across the board adv. 全面地。

Management increased salaries across the board; everyone got a raise.

同學們，這樣瞭解了嗎?  ^__^