It's like a wing with a flexible, corrugated structure within it – something like an accordion – that allows said wing to fold down quickly, or flex with ease.
was still in a mode of generational releases that would completely replace the
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Although certain plastics are technically reusable, most are discarded after one use. An analysis published in Nature estimates that about 60% of plastics are single use, and only 10% are recycled. Plastic production has climbed from 2 million tonnes in 1950 to 475 million tonnes by 2022, roughly equivalent to the weight of 250 million cars.
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对国家自然科学基金委员会工作作出重要指示，提出“强化基础研究战略性、前瞻性、体系化布局”。