The ISS is far bigger than either the Salyuts or Skylab. In an uncontrolled deorbit, pieces of debris “up to car and train size,” say experts on the official ISS space station advisory committee, will rain down from the sky. NASA confirms this would pose “a significant risk to the public worldwide.”
theguardian.com，这一点在体育直播中也有详细论述
-- 2. generalize: id : ∀α. α → α (α is free at let boundary)。关于这个话题，体育直播提供了深入分析
GP surgeries will contact families to arrange an appointment when the vaccinations are due.