chromatographic technique

例句：

1. 1.The scientists used the technique to analyze the chemical composition of the sample.
   科学家们使用该技术分析样本的化学成分。
2. 2. This method is widely used in the field of chromatography.
   这种方法在色谱领域广泛使用。
3. 3. The chromatography technique has greatly improved the efficiency of sample preparation.
   色谱技术大大提高了样品制备的效率。