他对同事们点点头，他们跑到大厅加入了已经在赶赴爆炸现场的警官队伍。
He nodded to his colleagues, and they ran into the hall to join police officers already rushing to the site of the explosion.
即使宇宙大爆炸发生在约150亿年前，它的回波仍然以背景辐射的形式残留着，仅比绝对零值高一点点。
Even 15 billion years or so after the Big Bang, echoes of that event still linger in the form of background radiation, only a few degrees above absolute zero.
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