他说该党的成立代表着赞比亚历史上的一个里程碑。

He said the launch of the party represented a milestone in Zambian history.

《柯林斯英汉双解大词典》

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.

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现在的大型飞机项目是下一个里程碑。

Now the big-jet project is the next milestone.

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