Wehavetalkedaboutsna的精选

问题详情：   Wehavetalkedaboutsnails(蜗牛)andtheirslowmove.Butmuchofthetimenailsdon’tmoveatall.Theyareintheirshells---sleeping.  Hotsunwilldryoutasnail’sbody.Soattheleastsignofhotsun,asnaildrawsi...