However,when two monkeys were placed in separate but adjoining chambers, so that each could observe what the other was getting in return for its rock,their behavior became markedly different.
【结构分析】
主干是whether...or whether...is an unanswered question。as yet表示时间。whether引导了两个从句,第一个从句的主干是such a sense of fairness evolved,第二个从句的主干是it stems from the common ancestor,其中that the species had 35 million years ago是从句,修饰ancestor。
【重点词汇】
as yet:迄今为止=so far
sense of fairness:公平感
evolve:v.进化、演变
stem from:源于、出现
ancestor:n.祖先
例:distant ancestors:遥远的祖先
近:forefather:n.祖先
【参考译文】
然而,当两只猴子被放在隔开但又相邻的两个房间里,以便让它们能够互相看到对方用石块所换回的东西时,它们的行为就会变得截然不同。
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