可追认合同还有第四种情形。

There is a fourth case with subsequently …

等离子体是物质存在的第四种状态。

Plasma is the forth state of matter.

第四种也是最后一种主要营养素是水。

The fourth and final primary nutrient is water.

我们进入了第四种模式，即晶体管，最后是积体电路。

We went to the fourth paradigm, transistors. And finally integrated circuits.