Dark energy is even more of a challenge: it comes neither from known particles nor from the empty space between them.
暗能量的研究则更加富有挑战性：它既不来自于已知的任何粒子，也不来自于粒子之间的真空区域。
Dark energy is even more of a challenge: it comes neither from known particles nor from the empty space between them.
暗能量的研究则更加富有挑战性：它既不来自于已知的任何粒子，也不来自于粒子之间的真空区域。
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