Translation of "momentary" into Persian

for reason, it is only a momentary undefinable sensation of life.

برای عقل فقط احساس آنی و نامعین زندگی است.

As if all that had happened since the garret time were a momentary fancy, or a dream

گفتی از آنچه تاکنون رخ داده تصویری زودگذر پیش نبوده است.

Nevertheless it had been very difficult not to betray a momentary surprise

با این همه، بروز ندادن تعجبی گذرا بسیار دشوار بود.