他是我妈妈的一个朋友。
当我和妈妈在美国的时候，我们就被我妈妈的一个朋友邀请和美国家庭一起过圣诞节。
When my mother and I stayed in America, we were invited by one of my mother's friends to have Christmas with an American family.
我所有的朋友都到了以后，我妈妈端上了美味的饭莱并捧来了一个大蛋糕。
When all my friends arrived, my mother brought delicious food and a big birthday cake.
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