全句是 two friends were arguing over whether a horse ever had a

全句是 two friends were arguing over whether a horse ever had all four feet or hooves off the ground when it galloped. To settle the bet, a photographer was asked to .
在这个句子里面 a horse ever had all four feet or hooves off the ground 是什么意思? off the ground 是离开地面的意思么?
to settle the bet 是什么意思?
the film featured actors speaking only during parts of the film
在这个句子里 featured 是什么意思?