on hap的用法和樣例：
例句
- I lighted on a rare book in a secondhand bookshop.
我在一家舊書(shū)店里偶然發(fā)現一本珍本書(shū)。 - She encountered an old friend on the road.
她在路上偶然碰到一位老朋友。 - He happened on the book in an secondhand bookstore.
他碰巧在一家舊書(shū)店里發(fā)現了這本書(shū)。 - I happen to meeting John on my way home from work.
我下班回家碰巧遇到了約翰。
