Some pages fold out to display particularly large pictures.
有的页面可以摊开，显示出一个超常大的画面。
Sometimes, however, a particularly large number of species have become extinct relatively suddenly.
但有时，相当数量的物种会相对突然地灭绝。
Sometimes, however, a particularly large number of species have become extinct relatively suddenly.
但有时，相当数量的物种会相对突然地灭绝。
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