Smith, a little-known outsider with limited political experience, came from behind to score a surprise victory.史密斯—一匹鲜为人知的政治黑马，从政经验有限，却后来居上意外获胜。The Olympics can make sporting heroes out of previously little-known athletes.奥运会能把原来名不见经传的运动员变成体育界的英雄。A little-known separatist group claimed responsibility for the explosion.一个鲜为人知的分裂主义组织声称对这次爆炸负责。