找出下列句子的一處 語法錯誤：
    When people undertake the task of teaching, in addition to sharing their knowledge, they are setting an example for students on their words and deeds.
    ♜ 適用考題：
    Students are more influenced by their teachers than by their friends. (TPO 18)
    答案：
    When people undertake the task of teaching, in addition to sharing their knowledge, they are setting an example for students by/through their words and deeds.