請回答下面的問題，測測自己的英語智商：
What kind of pool can't you swim in?
得意地笑你猜不出……
答案：carpool。
car pool
英語中，pool常見的意思是「水塘，水池」，也可以指一種共同的物品供應，例如貨幣，可以被許多人使用。例如，當人們為了省油省錢而一起開同一輛車時，就稱之為「car pool」，相當於漢語的「拼車」。
例如：
John and Brittany, along with several of their school friends, were invited for a swim at the Garcias pool. The Garcias house was far away and the kids wanted to drive together to save gas. They went in two car pools and spent the whole afternoon swimming.
約翰和布列塔尼以及他們學校的幾個朋友被邀請到加西亞遊泳池遊泳。加西亞家很遠，孩子們想一起開車省油。他們拼了兩輛車，整個下午都在遊泳。