FirstFT: the day's biggest stories
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Thinking Step 2: 推理第一个人。如果他不想要，他会直接说“不”（因为只要有一个不要，全称命题为假）。他说“不知道”，说明他自己想要，但他不确定后面两个人想不想要。
One study often cited is by Canadian psychologists Donald Dutton and Susan Painter. In research published in 1993 while they were at the University of British Columbia, they followed 75 women after they had left abusive partners.