The US space agency has released a "pre-solicitation" for what is expected to be a hotly contested contract to develop a spacecraft to orbit Mars and relay communications from the red planet back to Earth.
On Wednesday, however, the US Treasury said it would ease some small private sector transactions, including oil sales, to "support the Cuban people, for commercial and humanitarian use".
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2. 情绪经济与细分兴趣IP： 围绕宠物健康、治愈系内容、潮玩收藏或特定亚文化社群（如谷子经济、演艺经济）进行精细化运营，满足消费者日益具体的情绪价值需求 [4, 15, 54]。
(double)(end - start) / CLOCKS_PER_SEC * 1000,