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Almost 30,000 pieces of debris are calculated to be free-floating in space, created when rockets break up in space or satellites disintegrate.，推荐阅读搜狗输入法2026获取更多信息
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And though most scientists hail vaccines as one of public health’s greatest achievements, they have provoked fear, distrust, and contentious resistance since Edward Jenner invented the first vaccine, to prevent smallpox, in the late 1700s.