“成球形”用英语怎么说？

雪在马蹄下积成球形.The snow balled undcr the horse's feet.第三型规则内曲型: 小花平顺地向内曲成球形.Class 3 Regular Incurve: The florets smoothly incurve and form a ball.这种动物将身体缩成球形, 锋利的毛发向外伸着,保护着自己.This animal prorects itself by rolling up int...