Strange shadows rolled across the field like living creatures.
奇怪的影子像活物一样在田野上滚动。
英语百科
Shadow roll
A shadow roll is a piece of equipment, usually made of sheepskin or a synthetic material, that is attached to the noseband of a horse's bridle. Like blinkers, it partially restricts the horse's vision, and helps him to concentrate on what is in front of him, rather than objects on the ground (such as shadows).