I have a great sports collection 为什么sport要加s

I have a great sports collection 为什么sport要加s a great sports collection为什么不用sport He has a great sports collection collection为什么不加S sports为什么加 a sports collection 为什么sport要加s?究竟有什么含义? Sonia Hall has a sports collection.为什么要加s 有这个句子.I have a great sports collection. I like sports!----为什么sport要加s? I have a sports collection henry has a great sport collection为什么不是herry mang sports col have a great sports collection什么意思 He have a great sports collection.改错 do you have a sport collection请问collection是什么意思、这里的sport要不要加