The sights of the gun must be in alignment with the target.
枪的瞄准器必须与射击目标对准成一线。
2
You don't have to take any pains at all with them; you don't have to have a rest, you don't have to have any sights on the gun, you don't have to take aim, even.
你们不必在这些东西上花什么功夫；你们不必搞个枪架，你们不必在枪上装什么准星，你们连瞄准都没有必要。
3
This was at first a pair of master gunsights that were offset by the necessary lead angles and sighted on the target.