Touch with your hands. Sha Bai Bei, also known as Sha Bai and Bai Bei, is a kind of Chinese clam. The body is oblate, the body color is generally white, and the shell is bright, which is widely distributed in Zhanjiang and Hainan. Shellfish meat is delicious, fresh and sweet, and has high nutritional value. If you touch the shell with your hand and it closes immediately, it is alive. Those who don't close their shells or open them are all dead clams.