sporadic

adj. 偶尔发生的,零星发生的,分散的

sponger, sponginess, sponging, spongy, sponsor, sponsorship, spontaneity, spontaneous, spontaneous combustion, spontaneously, spoof, spook, spookiness, spooky, spool, spoon, spoon-feed, spoonerism, spoonful, spoor, sporadically, spore, sporran, sport, sportily, sportiness, sporting, sportive, sportively, sportiveness, sports car, sports jacket, sports writer, sports-editor, sportscast, sportsman, sportsmanlike, sportsmanship, sporty, spot,