Donald Trump has spent much of his second term at war with science and scientists. He is cutting staff at institutions such as the Environmental Protection Agency (EPA) by a third, and has cancelled or frozen up to 8,000 federal research grants. This hasn’t just hurt individual research programmes, it has damaged America’s credibility as a reliable partner in the scientific community. It is not surprising that many researchers – one poll last year by the journal Nature gave the number of 75% – say they are considering leaving the US entirely.
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Bob’s world stacked five times
放弃对以境内目标的全面打击，转而就近打击周边海湾国家的美军基地，是伊朗此次反击的核心战术。在张学峰看来，这背后有伊朗明确的战术与战略考量。