探究暗能量的本质是自然科学最大的难题之一。
Understanding the nature of dark energy is one of the biggest problems in science.
生命起源问题是科学上最悬而未决的难题之一。
The origin of life is one of the great unsolved problems of science.
这是科学家用来研究人们怎样决定对错的标准道德难题之一。
That is one of the standard moral dilemmas that scientists are using to study how people decide between right and wrong.
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