direct color的用法和樣例：
例句
- Effects of calcining temperature and dosage of salt sludge absorbents on color removal were studied.
採用氯鹼工業的含鎂鹽泥對直接染料廢水進行脫色處理。 - 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。
