这是智能手机发展中的巨大里程碑，如今大多数美国成年人都拥有智能手机，这种情况在全球范围内也变得越来越普遍。
It was a huge milestone in the development of smartphones, which are now owned by a majority of American adults and are increasingly common across the globe.
京张高速铁路于2019年12月开通。这条铁路是中国铁路发展的一个里程碑，因为它采用了铁路建设的最新技术。
The opening of the Beijing-Zhangjiakou high speed railway took place in December, 2019. The railway is a milestone in China's railway development because it has used the latest technologies in railway building.
近年来，我国的公路建设飞速发展，高等级公路通车里程快速增加。
In recent years, China's rapid development of highway construction, high grade highway mileage increase rapidly.
随着互联网的迅猛发展，高校上网已成为现代教育的一个重大的里程碑。
Along with the rapid developing of world wide web, Internet has become a significant milestone of the modern education in universities.
随着互联网的迅猛发展，高校上网已成为现代教育的一个重大的里程碑。
Along with the rapid developing of world wide web, Internet has become a significant milestone of the modern education in universities.
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