The first reason is concern that Israel will perceive the existence of one or two Iranian bombs as an existential threat, demanding a pre-emptive military attack – with or without US support, but in either case with resources that Iran knows it cannot match. Iranians think such an attack unlikely if they do not cross the red line of actual weaponization.
首先，以色列会将伊朗最先制造出来的一到两个原子弹视为实质性威胁，并发动一场先发制人的攻击，但无论以方有没有美国撑腰，伊朗都自知不是对方的对手。因此伊朗人认为只要不越过了真正拥有核武器这条红线，就能保住太平。