细水长流（細水長流）　

◎ 细水长流 xìshuǐ-chángliú

(1) [economize to avoid running short]∶指有计划地使用有限财物,使不致缺乏

(2) [go about sth. little by little without a letup]∶比喻一点一滴不间断做某件事