around
around和round都可以用作副词和介词，现在around在英国比从前少用，但在美国却很常用。下面各句都是美国英语：
- He turned around.
- Like the moon, the arficial satellites（人造卫星）move around the earth.
- I went around to the post-office.
- He loafed around the city.
- They live in the house around the corner.
- Around 800 men came.
在英国第一句到第五句里的around都改作round，第六句里的around改作about。
