practise upon (或 on)

• • 在…上练习(或实习、实验)：

    My son is always unwilling to practise upon the piano as regularly as he should have done.

    我儿子总是不愿意按规定应该做的那样来练钢琴。

  • 利用(别人的弱点等)；欺骗某人：

    She has practised upon my credulity with huge success.

    她利用了我的轻信大获成功。

  • 实行，进行：

    Torture was certainly practised by Europeans upon Europeans.

    欧洲人也自相残杀。