那位销售代表因向医生提供回扣以推销药品而被调查。

The sales representative was investigated for offering ___kick-backs to doctors to promote the drugs.

使用割草机时要小心，刀片碰到硬物会产生强烈反弹。

Be cautious with the lawnmower—a sudden ___kickback can occur if the blade hits something hard.