①. Digital preservation（数字保存）makes it possible to get back a photo or other important things online you accidentally deleted.

②. After 3G and 4G, 5G is on the way. It's reported that 5G promises download speeds that are 10 to 20 times faster than what we have now.

③. Built between 1163 and 1250, Notre Dame（巴黎圣母院）is one of the finest examples of French Gothic architecture（哥特式建筑）in the world. It is also home to many priceless works of art. However, it's a great pity that a fire broke its spire（尖顶）and a large part of its roof.

④. Hanfu, the traditional clothing of Han Dynasty, has become more and more popular among Chinese young people in recent years.

⑤. A car company in Korea worked out a new concept car（概念车）which has legs. The legs allow the car to climb over 1.5-meter-tall walls and step across gaps of the same length.

⑥. The Forbidden City's name mentions the purple color because ancient Chinese astronomers（天文学家）believed that Polaris（北极星）, the purple star, was in the center of heaven（天堂）and the heavenly emperor lived in it.