英语翻译a fourteen year term.year为什么不加s

英语翻译a fourteen year term.year为什么不加s 英语翻译Fourteen year old DANIEL RADCLIFFE (Harry Potter) once a I am a 11-year-old girl.为什么girl后面不加s 七年之痒的翻译：the seven year itch中的year为什么不加S an eight-year-old boy为什么year不加s 这属于什么语法 Deenie is about a thirteen-year-old girl.中的year为什么不用加s? 为什么two-year-old的year不加S而two-hundred-words的word要加S 英语翻译Erik was a fourteen-year-old boy.He thought he was a you 英语翻译Enk was a fourteen-year-old boy.He thought he was a youn 英语翻译Australia's four-term school year begins in February wit 为什么Six Years Old.中Year要加S呢? he is 18 years old.为什么year要加S