The E. coli robot Eck raced along the intestinal wall when a powerful torrent of acidic fluid suddenly surged toward it, swallowing it whole in an instant.
The bifidobacterium robot Shuangqi was patrolling leisurely when, in a flash, a mysterious beam pierced the intestine and shone upon it, making its whole body glow with an eerie light.
The lactic acid bacteria robot Suanbao was working hard to break down food when the intestine suddenly contracted violently, and a huge, unknown object charged out of the darkness.
