be good at,意思是擅长干某事。
I am good at playing soccer.我在踢足球方面很擅长;He is good at swimming.他很擅长游泳;My mother is good at cooking.我妈妈擅长烹调;She is good at singing,she is a good singer.她唱歌很好,是一位很棒的歌唱家;My brother is good at learning.我哥哥学习很好。
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