2. The negative gradient is a
throwback to the earlier days of chromatography when columns were less stable than they are today.
负梯度是一回撤的过程,早期的色谱柱子没有今天的那么稳定,所以需要这样做。
3. FARC's kidnap and murder of a provincial governor in late December was a grisly
throwback to the bad old days of a decade ago.
去年十二月的哥伦比亚革命武装力量的绑架案和一个省州长的谋杀案让人惊恐地想到十年前的那些黑暗日子。