彻查这类收取回佣的指控: conduct a thorough inquiry into the kickback allegations
竭尽: use up; exhaust; spare no effort; do all one can; to the best of one's ability; do one's utmost 短语和例子竭尽全力作最后挣扎 do everything in one's power to make a desperate last-minute stand; 竭尽造谣诬蔑之能事
竭尽心力: exert one's heart and strength to the utmost -- with all one's mind and energy; exhaust all one's energies [mental abilities]; put one's body [heart] and soul into a task; try one's utmost
