他在论坛上使用小号给自己的帖子点赞，被抓到进行刷分行为。

He was caught ___smurfing by using alt accounts to upvote his own posts on the forum.

那个职业玩家用新账号在比赛中大杀四方，结果被认出是个小号。

The pro gamer was exposed as a ___smurf when he dominated the match with a new account.