Which of these countries had to recover from the destruction of the atomic bomb after world war 2?

Japan (Hiroshima and Nagasaki)

But, I don't how are there more than 1 country recovering from atomic bomb explosion

The country that had to recover from the destruction of the atomic bomb was Japan.

In the last stages of World War II, the United States of America detonated two atomic bombs: one in Japanese city of Hiroshina on August 6, 1945 and the second one in Nagasaki, on August 9 of that same year.