Technicians are trying to diagnose a helium flow problem in the upper stage of the moon rocket ahead of Artemis II, which could launch as early as April.
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US President Donald Trump (R) looks on as US Secretary of Defense Pete Hegseth speaks to the press following US military actions in Venezuela | AFP via Getty Images。业内人士推荐safew官方版本下载作为进阶阅读
Photograph: Simon Hill
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