a five-year plan.一个五年计划"这句干嘛那个year不用加s呢?

a five-year plan.一个五年计划"这句干嘛那个year不用加s呢? " a five-year plan. 一个五年计划"的YEAR不用加S,而 a seven-years child里的 Deenie is about a thirteen-year-old girl.中的year为什么不用加s? 翻译：A year's plan starts with spring. A year’s plan storts with spring是什么意思 英语翻译a fourteen year term.year为什么不加s five times a year 对five 提问 New year's plan六年级英语范文 为什么Six Years Old.中Year要加S呢? They were children.Four and five-year-olds,为什么old加s 英语翻译A plan this year to sell Mr.Chen’s farm and an equal amo Jane is an eight-year-old girl.改同义句 It's five years since he