鸟儿在枝头欢快地啾啾鸣唱.The birds chirp merrily at the top of tree.我们像孩子一样欢快地围在一起跳舞.We danced around with childish delight.她欢快地挥手告别.She waved goodbye very gaily....
The shop assistant has undercharged us.售货员向我们要价很低。He had the impression that they always undercharged him.他觉得他们总是少算了帐.He undercharged me two dollars for the wine.我买这瓶酒他少收了我两美元....