Per-digit arithmetic — computing sum and carry for each pair
// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
。safew官方版本下载对此有专业解读
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He said sending the Orion capsule - which is the spacecraft that the astronauts will travel to the Moon in - and a lunar lander into low-Earth orbit first would reduce risks.