准确地观察枪膛内部状态,在有些情况下是十分必要的。过去,通常采用的方法是将枪膛照亮,然后从前面或后面看一遍,这样虽然对内膛的状态有所掌握,但对其详细状态不能了解得很清楚。 Accurately observing the internal state of the gun bore is in some cases necessary. In the past, the usual method was to illuminate the chamber and look at it from the front or back so that although the state of the bore was mastered, its detailed status could not be clearly understood.