improve是动词，不能说可数。
vi. 增加变得更好
Her quality of life has improved a lot since her child started making money.
Things will improve as time goes on .随着时间的推移，情况会改善的。
The haze of distance improves the view .远处的迷雾美化了他们的形象。
" keeping improving " is our watchword .“精益求精”是我们的口号。
The condition of her family was not improving ..她的家境仍无转机。
The students have improved their listening .这些学生的听力提高了。
