它的地铁系统里程数持续增长(French, 1979)。
Its metro system continued to add on new mileage as well (French, 1979).
图 1 中的其他里程碑与实现系统里程碑相关，它们必须在 DOA 之前的各自最后期限之前就绪。
The other milestones in Figure 1 relate to fulfillment systems milestones that must be ready by their corresponding deadline before DOA.
到目前为止，中国已经完成了北斗卫星导航系统的第三代网络系统，这是国家空间研究工作一个新的里程碑。
So far, China has completed the third generation network of China's BDS. It was a new milestone in the nation's space research work.
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