The river water is flowing in the opposite direction.

This problem has a paradoxical answer.

He was prepared for the enemy's counterattack.

He began to strike back against the enemy.

He was plotting a rebellion against the king.

The doctor recommended a urine test to examine my urine.

She hung a new curtain.

Barium is one of the elements widely distributed in the earth's crust.

He threw the fishing hook into the sea.

Last night, I was as if tightly bound by metal chains and couldn't move at all.