兄台,我来帮你了, 没人回答的原因我想有两点,一是你问的这两个词组比较不常见.二是你木有悬赏分.不过,我来了,那这两条就不管啦.哈哈. The boy waved goodbye to his family and began his journey alone. 少年同自己的家人挥手告别,踏上了自己一个人的路途. On seeing her mother,the little girl waved a greeting and said:"mum,i'm back" 一看到妈妈,小女孩儿就马上挥手跟妈妈打了个招呼,说道:“妈妈,我回来啦” 给某人挥手打招呼用的介词是to,如第二个例句里所示. 再问: 亲人啊。啥都不说了。