The enemy was surrounded ring upon ring.
It is besieged ring upon ring by the people of the whole world.
Concubines, a unique female school in the society of polygamy, endure cultural oppression ring upon ring.
In the well-differentiated astrocytoma showed structure of ring upon ring, the inner ring was the basement membrane of blood vessel, while the outer ring was the glial membrane.
Dimples diffuse annularly on the surface of water. The shadows of leaves and flowers with the lipper undulate, ring upon ring.
