求翻译：张宁是中国著名乒乓球运动员，他出生于1981年10月5日，他身高1.68米，他开始学乒乓球在5岁，1991年他参加北京乒乓球队，12岁参加国家乒乓球队是什么意思？

Zhang Ning is a famous Chinese table tennis player, he was born on October 5, 1981, he was standing about 1.68 metres, he began to learn table tennis at the age of 5, 1991 he attended the Beijing table tennis team, 12 years old to participate in the national table tennis team