疫苗从研发到使用有"I've been thinking."Do you see now why you have to go to school five hours a day, and sit on a hard seat studying still harder lessons, when you would much rather sneak off and go in swimming? It is so that you may build up these thinking spots in your brains. … We begin young, while the brain is still growing. With years and years of work and study, we slowly form the thinking spots over our left ears, which we are to use the rest of our days. When we are grown up, we can no more form new thinking places. …I. The slave had no protection against the avarice, rage, or lust of the master, whose authority was founded in absolute property; and the bondman was viewed less as a human being subject to arbitrary dominion, than as an inferior animal, dependent wholly on the will of his owner.
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