細水長流（細水長流）　

◎ 細水長流 xìshuǐ-chángliú

(1) [economize to avoid running short]∶指有計劃地使用有限財物,使不致缺乏

(2) [go about sth. little by little without a letup]∶比喻一點一滴不間斷做某件事