对于体力或情感上的付出通常用不可数形式，其它的则可数。如You should put more effect into your work.You are making even greater effects to interest more children each you have tought.
和experience一样，得看是什么解释了当解释为努力，尝试；杰作时可数，+s当解释为工作；成就是不可数
