反弹 (fǎn tán): в Bounce

He threw the ball hard against the wall, and the ball immediately bounced back and hit him right in the face.

The stock market fell sharply yesterday, but this morning after the opening it gradually rebounded, and by the close it had risen by two percent.

The rubber ball bounced off the wall onto the ground, then bounced up again, and the children happily ran after it.

His condition improved for a while, but before long it relapsed, and the doctor suggested he stay in the hospital for observation.