Metaphor by building four blood types
O: western stone houses, heavily fortified to strangers, opened the door to internal take in everything in a glance.
Type A: Japanese style of wooden houses, elegant in appearance, but the internal structure is complex, it is not easy to see deep;
B: cave, thick see too, but the most open, you can see all very easily;
AB: beautiful villa, the biggest characteristic is far away from the urban areas and the crowd, but to stay at a respectful distance from sb at heart.
By building the analogy four blood types related content：
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