What is written on the rich stone tablet of Xisha Islands in the first volume of the third grade?

Navy regains Xisha Islands Monument. The first volume of the third-grade text, The Abundant Stone Monument of Xisha Islands, was written for the navy to recover the Xisha Islands monument, and the back was engraved with the four characters "Ordinary South China Sea". Xisha Islands, one of the four islands in the South China Sea of China, consists of Yongle Islands and Xuande Islands, and is the largest archipelago in the South China Sea of China.