航空航天供应链咨询机构AeroDynamic Advisory管理董事凯文·迈克尔斯表示，虽然目前钇供应紧张尚未对发动机总装造成打击，但制造商依然高度警惕。“这已经成为一个需要重点监控的项目，也是中国展示其在稀土领域影响力的一个具体例子。”他说。
Prior to the organ transplant list, donation relied entirely on people carrying organ donor cards.
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"We have to try and test to find this optimisation of friction, of back-driveability," says David Kehr, president of humanoid robotics. "It's really a big puzzle."
Efforts by social media companies to remove children from their platforms will prove difficult, simply because they know how to get around them.
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