ㄐㄩˋㄕㄚshāㄔㄥˊchéngㄊㄚˇ

  1. 兒童堆積泥沙成佛遊戲遊戲成就功德妙法蓮華經·》。比喻積少成多只要努力聚沙成塔顯現成績。」積少成多集腋成裘眾志成城

sand grains accumulate to make a tower a tower (idiom)​; by gathering small amounts one gets a huge quantity, many a mickle makes a muckle
Kleinvieh macht auch Mist