Nasa is adding an extra mission to its Artemis programme before it attempts to land astronauts on the Moon for the first time in half a century.
1. 选择步长序列（如: n/2, n/4, ..., 1）
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В России выпустили первый учебник по БПЛА для школьниковВ России для 10-11-х классов выпустили первый учебник по беспилотникам
The Dutch have quietly adopted working just a four-day week. But what has been its impact, and can it last?