For a long time, the study of consciousness was considered too far out to study.
长期以来,关于意识的研究被看作是遥不可及。
The study of consciousness is difficult, and challengeable as well for psychological researchers.
意识研究是心理学中的一大难点,也是一项富有挑战性的工作。
It wasn't that long ago that the study of consciousness was considered to be too abstract, too subjective or too difficult to study scientifically.
还在不久以前,意识还被认为太抽象、太主观或者太艰深以致不能科学地进行研究。
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