type of variables

例句：

1. 1. The car has three different types of engines.
   这辆车有三种不同的发动机。
2. 2. He has a type of cat that is very friendly.
   他有一类猫非常友好。
3. 3. The type of soil affects the growth of plants.
   土壤的类型影响植物的生长。