【细水长流】〖xì shu cháng liú〗[Water flowing out in a trickle takes a long time to exhaust; economize to avoid running short; go about sth. little by little without a letup; a small but steady stream]

细大不捐量材用，

水积成川贵节能。

长此以往资源保，

流景扬辉共大同。