在不少养宠家庭里，给宠物选粮这件事，已经越来越像在给孩子挑辅食。配料表要看蛋白来源是否清晰、有没有添加剂、是否有功能性成分……
"[In] the 1960s [it] turned out, in hindsight, we had a near-endless schedule margin there," Isaacman said. "That is certainly not the case today. I'd say this is very, very close from a timeline perspective."
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Long-duration missions in space take a toll on the body, astronauts lose bone density and suffer muscle loss. Blood circulation is also affected, and fluid shifts can also impact eyesight.
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