How to read the poem "Boiled potatoes and beans" written by Cao Pi?

ZH: Dolan Dolan Quayle. I'm Fǔ Hiran, and I'm Fǔ Zhang Ning. This is a good example.

This poem is from "Seven Steps Poetry" by Cao Zhi, and the translation is as follows:

The beans are boiling in the pot, the beanstalk is burning under the pot bottom, and the beans are crying in the pot.

Beans and beanstalks originally grew on the same root. How can beanstalk torture beans in such a hurry?