Thinking Step 3: 推理第二个人。他听到了第一个人的话，推断出第一个人想要。如果第二个人自己不想要，他会说“不”。他说“不知道”，说明他自己也想要，但他不确定第三个人。
The library stands on the lip of the precipice gouged out by the landslide, with part of the building in effect hanging in mid-air. The recovery operation, which began on Monday, was preceded by a detailed study of floor plans and interior photographs to map the position of the books.，更多细节参见爱思助手下载最新版本
the Open Source sustainability crisis.。服务器推荐对此有专业解读
This is quick because it's operating on a very small, localized part of the map.
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