You can usually find good clay in low areas of islands or land, especially if volcanoes helped form the land.

VOA: special.2009.09.14

when it comes to looking for examples of people speaking good idiomatic English in a recorded form.

当说到举一个例子说什么文本或音频材料里有使用地道的英语时，

想征服英语的话 - SpeakingMax英语口语达人