to start to include more different types or things

Millions of years ago, changes in the earth's climate caused animal and plant life to diversify. 数百万年前，地球气候的变化导致了动植物的多样化。

If a business diversifies, it starts making new products or offering new services.

Many wheat farmers have begun to diversify into other forms of agriculture. 很多麦农已经开始采用其他农业种植模式。