不是一次而是好几次，就好象巨大的鞭炮声。我们马上从那里跑出来。
It was like the sound of loud crackers, not one but several, we just ran out of there.
重力能使光线弯折，使巨大的星系团象望远镜一样，扭曲背景星系的图像，使之变得细长。
Gravity can bend light, allowing huge clusters of galaxies to act as telescopes, and distorting images of background galaxies into elongated strands.
一个网上的视频剪辑描述的是，一个巨大的房间里，成千本书象多米诺骨牌一样错综复杂地排列着。
One internet video-clip features a vast room in which thousands of books have been lined up like dominoes in intricate patterns.
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