It is an interesting reflection.before the twentieth century that no one had suggested that the universe was expanding or contracting. 从未有人暗示过，宇宙是在膨胀或是收缩。 从未有人提出过，宇宙是在膨胀或是收缩。 ⚫ It is an interesting reflection. before the twentieth century that no one had suggested that the universe was expanding or contracting. 从未有人暗示过，宇宙是在膨胀或是收缩。 从未有人提出过，宇宙是在膨胀或是收缩