当我们的社交圈中“不同背景的朋友”比例超过一定阈值时，幸福感会像坐过山车般下滑——但别慌！关键不是彻底打破舒适圈，而是学会在“同频共振”与“跨界碰撞”间找到平衡。

Muscle Atrophy: In microgravity, the muscles do not have to support the body’s weight, leading to significant muscle weakening. Astronauts typically lose about 1% of muscle mass per month. For example ...