" a five-year plan. 一个五年计划"的YEAR不用加S,而 a seven-years child里的YEAR要加要呢?
问题描述：
" a five-year plan. 一个五年计划"的YEAR不用加S,而 a seven-years child里的YEAR要加要呢?
答
谁说第2个要加了
2个都不要加!用连词符号的词做形容词,不加S