Nasa announced on Friday radical changes to its delayed Artemis III mission to land humans back on the moon, as the US space agency grapples with technical glitches and criticism that it is trying to do too much too soon.
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自路透社去年11月首次报道钇供应吃紧以来，钇价已上涨约60%，较一年前暴涨约69倍，一些涂层生产企业开始对原料实行配给。