为什么是every few minutes而不是every a few minutes

为什么是every few minutes而不是every a few minutes every few minutes every a few minutes中的every作何理解 用every few minutes写一句话 look at your watch every few minutes in a few minutes took a few minutes a few minutes是什么意思 a few more minutes a few minutes 为什么不是 even a few minutes later? 为什么a few minutes ago的few前要加a?