1. The Korean army called the female sniper of the People's Army "two seconds", because the gunshot would be heard only two seconds after the comrade-in-arms were shot. The male protagonist even deduced from this that the female sniper was 680 away from the Korean army. The gun was fired from a distance of meters, because the speed of sound is 340m/s. I don't know why the director made such a low-level mistake, he ignored the running time of the bullet. In the late World War II and early postwar period, the projectile velocity of sniper rifles and heavy machine guns was 800 to 1000 M/S. The speed of the sniper rifle bullet is generally around 900m/s, then set the running time of the bullet from launching to hitting the target to x seconds, then you can formulate the equation 900x=340(x+2), and solve it to get x=1.2 seconds, then the sound It takes at least "three seconds" to pass from the muzzle to the Korean army, and the distance is at least 1,000 meters away. So whether to call the sniper "two seconds" or to conclude that her sniper radius is 680 meters is wrong. It should be pointed out that under the technical conditions of the 1950s, due to the influence of external conditions such as bullet running stability and wind speed, it is almost impossible to snipe the target at a distance of 1000 meters.
Second, after the snipers fired nearly ten shots in different directions, the Han army determined the sniper's position and called for artillery support. In fact, after knowing the sniper radius, the surveyor can directly find the sniper position and call for artillery support based on the impact position of the "two shots" and the Kepler effect. That is to say, in the actual battlefield, the sniper only needs two shots in different positions to reveal the position, and the death of the 17-year-old child soldier can also be avoided.
3. The official entry into force of the armistice agreement is July 21, 1953 at 21:00 Beijing time, which is 22:00 in the East Nine District. The sky turned bright when the protagonist walked out of the tunnel. It is estimated that this may also be a symbolic meaning. Don't do more research.
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