半丝半缕

Explanation: Strand: line. Half a wire, half-thread line. Describe a small number of extremely small value of things. 　　Usage: Joint type; as object, attribute; describe what the value of low 　　Source: Lu Qing Zhu Bo "Zhijiageyan": "a rice porridge, when not come easy; Bansi half thread, constant reading of difficult material."