Travel, except during the Dark Ages, has continued to grow and, throughout recorded history, has played a vital role in the development of civilisations and their economies.
除了在黑暗时代之外，旅游业一直在持续发展壮大，并且贯穿有记录以来的历史，始终在各文明及其经济的发展中扮演着至关重要的角色。
They used an orbiting X-ray telescope called Chandra to study the way that clusters of galaxies grow. They discovered that this growth is stifled in exactly the way that dark-energy theory predicts.
通过“钱德拉”X射线绕轨太空望远镜对星系团的增长模式进行观测研究，他们发现，正如“暗能量”理论预测的一样，星系团的增长受到了抑制。
Problems grow in the dark and become bigger and bigger, but when exposed to the light of truth, they shrink.
难题在暗处会变大，但在真理的光照下，它便缩小。
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