广播电视英语短句 第 290 课：找到粘土-1

Clay is found almost everywhere in the world. 在世界的任何地方都能找到粘土。

It is formed by the action of wind and water on rocks over thousands of years. 随着数千年的时间流逝，经风和水作用于岩石之上而形成的。

The rocks change in both chemical and physical ways. 岩石在化学和物理上都产生了变化。

Chemically, elements like potassium and aluminum are added and taken away. 在化学上发生的变化是，像钾和铝这些元素持续着不断添加和逐渐流失的循环过程。

Physically, the rocks break down into smaller and smaller pieces. 在物理上发生的变化是，岩石被拆散成为越来越细小的碎片。