This technique eliminates unwanted facial hair quickly and painlessly.这种技术能快速且无痛地去除面部多余毛发。This is a game for children which painlessly teaches essential prereading skills.这是个能轻松教会孩子们课前阅读基本技能的游戏。We'll try to get through this as quickly and painlessly as possible.我们将尽可能又快又轻松地完成它。