协同作用往往是被动的；当两种事物联合在一起，而同它们的所作所为无关时所发生的一系列反应，才能称作协同作用。
Synergy is passive; it happens when two things come together regardless of what else they do.
本实验采用明暗箱被动回避反应和穿梭箱条件性回避反应测定，探讨了铅对大鼠学习与记忆的损害作用。
The impairment of learning and memory of lead exposed rats was evaluated by examining the passive avoidance response and conditioned avoidance response.
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