river和pool的区别

river是河的意思，而pool则是池的意思，区别可以从以下例子看出：

I know you can swim in the pool, but I not sure that you can swim in the river, there is many uncertainty thing could be happening in the river. 我知道你可以在游泳池里游泳，但我不确定你可以在河里游泳，河里可能会发生很多不确定的事情。