是可數名詞,其複數形式是math exercises,中文意思是,數學練習
例如
The worst thing a parent can do is to pressure preschoolers to perform — for example, by pushing them to read or do math exercises before they're ready.父母做的最不明智的事情就是強迫學齡前孩子去做一些事情—比如,當孩子還沒有發育到一定程度時就逼迫他們去閱讀或者做數學題。