1·PCB (polychlorinated biphenyl) : Any of a class of highly stable organic compounds prepared by the reaction of chlorine with biphenyl, a two-ring compound.
多氯联苯：任何一种由氯与联苯反应生成的非常稳定的二环有机化合物。
2·The time required for obtaining the polychlorinated-biphenyl extract after addition of the oily liquid to the first column (10) is generally as short as about 2-10 hours.
向第一色谱柱(10)添加油性液体至获得多氯联苯类抽提液所需要的时间通常为2 ~ 10小时左右的短时间。