是时候让小宇宙爆发了！ 《画江山》天赋系统大揭秘

百度 是一次驯化，还是多次驯化？接下来一个有意思的问题是，狗是在某一个地方被人类一次性驯化，然后向世界各地传播的，还是在不同的地方被独立驯化的？上世纪90年代，美国加利福尼亚大学的查尔斯·维拉等，把67个品种的狗的线粒体DNA与狼、小狼和豺狼的线粒体DNA作了比较，结果发现，从狗追溯到狼至少有4种分别独立的遗传线索。

An aerial drone photo taken on April 8, 2025 shows people planting coix at a sand industry experimental base in Yutian County of Hotan Prefecture, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

URUMQI, April 14 (Xinhua) -- The Taklimakan Desert in northwest China's Xinjiang Uygur Autonomous Region covers 337,600 square kilometers and its circumference measures 3,046 kilometers, making it the largest desert in China and the second-largest drifting desert in the world.

Thanks to decades-long sand prevention and control efforts, the Taklimakan Desert was completely encircled with a sand-blocking green belt on Nov. 28, 2024.

In 2025, Xinjiang aims to afforest a land area of about 796,000 hectares, including 562,666 hectares for frontline control in the Taklimakan Desert. These afforestations form a part of the Three-North Shelterbelt Forest Program, the world's largest afforestation program, which tackles desertification in northwest, north and northeast China.

Meanwhile, Xinjiang will further widen the sand-blocking green belt and enhance desert-locking efforts to achieve sustainable sand control while improving local livelihoods.

People arrange drip irrigation pipes at a sand-control experimental base in Yutian County of Hotan Prefecture, northwest China's Xinjiang Uygur Autonomous Region, April 8, 2025. (Xinhua/Ding Lei)

An aerial drone photo taken on April 7, 2025 shows oleaster saplings in Hotan County of Hotan Prefecture, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

An aerial drone photo taken on April 12, 2025 shows a grassland in Baicheng County, Aksu Prefecture, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

Volunteer Wang Chengbang checks seedlings at a nursery in Korla, northwest China's Xinjiang Uygur Autonomous Region, April 11, 2025. (Xinhua/Ding Lei)

An aerial drone photo taken on April 13, 2025 shows a photovoltaic power project in Xayar County, Aksu Prefecture, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

An aerial drone photo taken on April 9, 2025 shows staff members planting seedlings at a sand-control base in Qiemo County, the Mongolian Autonomous Prefecture of Bayingolin, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

An aerial drone photo taken on April 8, 2025 shows checkerboard sand barriers in Minfeng County of Hotan Prefecture, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

A staff member sorts cistanche at a cistanche planting base in Qiemo County, the Mongolian Autonomous Prefecture of Bayingolin, northwest China's Xinjiang Uygur Autonomous Region on April 9, 2025. (Xinhua/Ding Lei)

Fu Guoxi checks the trees at a green belt built by his father Fu Zhizhou in Hejing County, the Mongolian Autonomous Prefecture of Bayingolin, northwest China's Xinjiang Uygur Autonomous Region, April 11, 2025. (Xinhua/Ding Lei)

An aerial drone photo taken on April 13, 2025 shows a photovoltaic power project in Xayar County, Aksu Prefecture, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)

An aerial drone photo taken on April 11, 2025 shows a forest park in Hejing County, the Mongolian Autonomous Prefecture of Bayingolin, northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Ding Lei)