6 feet long是多长?

6 feet long是多长? 英语中 16' by 8 feet 是多长? two-feet-long还是teo feet long how long 是 时间多长 还是距离多长? 10 feet long?什么 feet（单数）long(反义词) The table is 8 feet long and 3 feet wide. It's about three feet long and two feet 5 feet ,6 inches是几厘米 用long造句,要有多长. 800-feet-long和800-foot-long哪个正确 会算么?好难啊Two ladders,one 30 feet long,the other 20 feet long a