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.

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。

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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.

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。

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One well-known method is the entrance and exit criteria of each iteration or milestone in your development lifecycle.

一个众所周知的方法是在您的开发生命周期中的每个迭代或里程碑的入口和出口标准。

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"Today's announcement is an important milestone in the development of new nuclear build in the UK, " she said.

BBC: New nuclear power plant at Hinkley Point C is approved

The code release is a milestone in the development program for Ubuntu's phone experience, and enables developers to port the platform to other devices.

ENGADGET: Touch-based Ubuntu preview coming February 21st, will work on Galaxy Nexus and Nexus 4

And since the signing of the Canada-U.S. free trade agreement, a milestone in the development of the modern era of globalization, that partnership has grown spectacularly.

WHITEHOUSE: President Obama and Prime Minister Harper Press Conference | The White House