direct dyestuff的用法和樣例：
例句
- It is shown that the application of rare-earth elements to staple rayon corduroy direct dye dyeing is practicable and the effect is perfect.
作者認為稀土對人棉燈芯絨織物在直接染料染色上應用是切實可行的，效果是理想的。 - In addition, rapid colorimetric determination of benzidine compounds released from photo-assistant reduction of selected direct dyes was also conducted.
並藉助聯苯胺類直接染料，通過其還原生成物氧化后的光譜測定，表徵了染料還原反應生成的聯苯胺。
