In the study, published on Thursday in the journal Science, the U.S. and Israeli researchers fed the rats saccharine, which made them sick and taught them to associate the taste with feeling unwell.

• 这项研究成果发表在周四的科学杂志上；美国和以色列科学家饲喂小白鼠甜味剂；使它们感觉不舒服、并让它们学会将这种味道与不适感联系起来(注释:实际上是建立条件反射).