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Easy difficulty hints, answers for Feb. 26 PipsNumber (3): Everything in this space must add up to 3. The answer is 3-1, placed horizontally.，这一点在服务器推荐中也有详细论述
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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.”
效率的提升，并不是少写了代码，而是减少了反复试错和信息查找的时间。。关于这个话题，搜狗输入法下载提供了深入分析