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(4) background light appearing at night, such as light from shore or backscattering of light from the ship;At that tail of the warhead, the drag armour-piercing firebomb is filled with a drag agent and a fireagent, Under the pressure of propellant propelling warhead, it will spontaneously ignite to produce open flame, So it can break through the oil drum and ignite or detonate the gasoline. However, the old-fashioned traced armour-piercing firebombs have obvious trajectories due to traced light when they are launched. Therefore, it is very easy to expose oneself while pointing targets to friendly forces. Therefore, the new tracer armour-piercing firebombs now equipped all start to burn and emit light only after the projectile flies out of the muzzle for a certain distance (the generally set safe distance is 100 meters, which makes it impossible for the enemy to judge the firing position with tracer ammunition, while targets within 100 meters do not need to be indicated by tracer), The principle is generally to ignite the tracer and combustion agent carried by the projectile by accumulating the heat generated by the warhead's friction with the air after flying for a certain distance to a certain extent.Originated from the United States. The 18th Olympic Games in 1964 was listed as a competition event.This is our bounden duty, but also our duty.2. Damage cannot be protected by Invincible Skills and Gods.故事讲述Jeaw受生病的祖母所托，替她去照顾Thathep家族唯一的儿子Chai，两人在打闹中产生感情。主人公对“理想的女性”的犹豫和矛盾。并不是“恋爱关系”，而是“恋爱感情”本身的痛苦和悲伤的故事有很多。