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HIV刺突蛋白gpl20受体是
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Britons prefer to wait for the service to be offered, rather than ask for it.
When British people make offers, they do expect them to be accepted.
For an informal visit of one's home in the U.K., it is not polite to arrive too early.
In the U.K., politeness towards women is still observed today as it used to be.
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