event a occurs every 14 minutes and event b every 12 minutes

event a occurs every 14 minutes and event b every 12 minutes 为什么是every few minutes而不是every a few minutes There is a b( ) every forty-five minutes at school There is a b( ) every forty-five minutes. every minutes ,还是every minute every few minutes every a few minutes中的every作何理解 There is a train every ten minutes.(对every ten minutes提问) there is a bus every five minutes?对every five minutes 提问怎么写? There's a bus every ten minutes.对every ten minutes划线提问 It is estimated that every two-and-a-half minutes a child is every five minutes什么意思