这大概就是所谓的observer effect(观察者效应):只有时间旅行者自己知道事情改变前后的不同,而旁观者是无从得知的。
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actor-observer effect 行动者观察者效应
Observer-expectancy effect 观察者期望效应
Participant-observer effect 观察者期望效应
But the presence of the tiny but growing U.N. observer team is having a "dampening effect" on the violence, Ladsous said.
CNN: Rights group: 'Annan plan has been ineffective'
But the presence of the tiny but growing U.N. observer team is having a "dampening effect" on what has been an atmosphere of "appalling" violence, said U.N.
CNN: U.N. notes cease-fire violations from both sides in Syria
This is that a lens produces its biggest effect when it is halfway between source and observer.
ECONOMIST: Cosmology: I spy with my little gravitational lens | The
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