800-feet-long和800-foot-long哪个正确

800-feet-long和800-foot-long哪个正确 6 feet long是多长? feet（单数）long(反义词) 6 feet long是多长? 为什么It's a four-foot-long box.=The box is four feet long.主要在four-foot和four feet上 it was found to be over thirteen feet long 请问to be如何理解和解释, It's about three feet long and two feet The table is 8 feet long and 3 feet wide. two-feet-long还是teo feet longIt's a ______ ruler.a.two-feet-long;b.two feet long;c.two-foot-long;d.two foot long请问这道题选什么.希望能给详细的解释下. 10 feet 理解不到feet是什么意思,知道的朋友说一下,顺便翻译一下10 feet long the ten feet tall pole The ___ tall pole cast a ____ long shadow.A ten feet ; twenty feetB ten-foot ; twenty –foot为什么A 不对呢?不是有这个结构吗：数词+名词复数+形容词 ,中间不用连字符.就如800米比赛：800 meters l he has long legs and big feet同义句 foot和feet用法区别 5feet 1和5feet 3是多高? gimme your feet 和 give me your feet Our PE teacher ____us try very hard in the running practice fo 800 meters答案和讲解A asked B made C let D told 这儿能用length代替long吗,为什么These eating varieties are sometimes twelve feet long long和length有什么区别?都译为长度时,它俩有什么区别呢?Length/n.长度。It is six feet in lengthLong/adj.长的。It is six feet long.当长度译时,只是词性上的区别?