地球处于来自超大质量黑洞产生发射物的“枪口”方向，但是这些被叫做耀变体的天体处于一个对于我们来说非常安全的距离位置上，成万上亿光年。
From the Earth we look down the barrel of jets from supermassive black holes, however these so-called "blazars" are at much safer distances of millions or billions of light years.
当选手轻松站立时，枪口指向地面位置距离其脚部超过一公尺(三英尺)的枪套。
A holster, with the muzzle of the handgun pointing farther than 1 meter (3 feet) from the competitor's feet while standing relaxed.
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