Where is the poem about Dalian?

Dalian Lushun

We are Lushun and Dalian, twin brothers.

How should our destinies be compared?

Two strong neighbors kicked me back and forth,

We are two mud balls at the foot of the mob.

Mom, it's time to go back. Bring us back quickly.

You have no idea how much our children miss you!

Mom! We'll be back, mom!

Wen Yiduo's Song of Seven Sons