Isaacman pointed to hydrogen leaks on Artemis I and helium flow problems on Artemis II as signs that a three‑year gap between launches is not sustainable. When teams only fly every few years, he said, they lose "muscle memory" — the routine, hands-on experience required to handle a complex rocket safely and efficiently.
The Shark vs. Roomba debate is old news. Here's how both robot vacuum brands got dethroned.
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《白鹿原》人物分析：乱世浮沉中的人性剖析
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