on a one-year program为什么用on,

on a one-year program是什么意思? on a one-year program为什么用on, one year 可以说成 a year a year 和one year的区别 The Peiking University graduate first went there as a volunteer on a one-year program.翻译 he went there as a volunteer on a one-year program. on a one-year program为什么用on,只是问为何用on,不问别的,不需要翻译, 英语翻译：up 21.5 percent on a year-on-year basis a year /one year那个是标准的啊?谢谢 a year or two 还是one year or two one year later 跟a year later有什么区别 Tim is ____boy.He can say a few words.A.an one-year-old B.a one-year-old C.an one-year oldD.a one-year old a one-year program什么意思 One （ ）year is a century contract:one year with a possibility to Only have one year ,come on everyone是什么意思 The rate paid on one-year deposits 是什么意思 in germany,___ last year teleshopping was only possible on one channel for one hour every day.A by B untillinjure 和hurt 的区别在哪里?