The bladder, a Chinese word, is pronounced qi ú d ǎǎǎ n, which means a soft and elastic bag made of rubber, which is put in the ball and inflated to make the ball elastic.
A soft and elastic bag made of rubber, which is placed in the ball and inflated to make the ball elastic.
General ball games (such as football and basketball) have a tank to support them. Most of them are gas filled, body shaped spheres. This spherical liner is called the bladder [1]
