Number (3): Everything in this space must add up to 3. The answer is 3-3, placed vertically.
（作者为中国工程院院士，本报记者王云娜采访整理），这一点在91吃瓜中也有详细论述
，这一点在谷歌中也有详细论述
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Chris Wheeler says it is impossible to budget for heating oil because of its price volatility。关于这个话题，超级权重提供了深入分析