请教个if的词义确定的问题Indeed,nightmaresappeartohavebeenthesubjectoffarmorestudiesthanmorepleasantdreams,iffornootherreasonthatwhilepleasantdreamsareeasilyforgottenuponawakening,nightmarestendtolingeri

Question

请教个if的词义确定的问题
Indeed,nightmares appear to have been the subject of far more studies than more pleasant dreams,【if】 for no other reason that while pleasant dreams are easily forgotten upon awakening,nightmares tend to linger in our minds is sufficient to demand attention.
我觉得 if 在这个句中并没有实义,应该依照字典中的这个意思来理解：used to express surprise,astonishment,dismay,etc 请您指教,

Answer 1

不对.if for no other reason than是个成语,意思是本来有很多理由,但是后面讲的那一个理由就足够了.
这句其实有个语法错误.than不能省略,但是that可以省略,所以
Indeed, nightmares appear to have been the subject of far more studies than more pleasant dreams, if for no other reason than that while pleasant dreams are easily forgotten upon awakening, nightmares tend to linger in our minds is sufficient to demand attention.
或者
Indeed, nightmares appear to have been the subject of far more studies than more pleasant dreams, if for no other reason than while pleasant dreams are easily forgotten upon awakening, nightmares tend to linger in our minds is sufficient to demand attention.
都可以,而没有than则是不对的.
再给你两个例子：
If for no other reason than that it is good for the environment, we ought to eat organic food.
I'm going to vote for Candidate X on Tuesday, if for no other reason than his promise to send every citizen $100.