20世纪，消化系统溃疡开始变得普遍，那时弗洛伊德和其他精神分析学家的理论也开始风行。
Peptic ulcers became more common in the 20th century, at the same time that these theories of Freud and other psychoanalysts became popular.
躲猫猫游戏风行世界各地，跨越语言和文化障碍，为何它如此普遍？也许因为它是一种强大的学习工具。
Peekaboo is a game played over the world, crossing language and cultural barriers. Why is it so universal? Perhaps because it's such a powerful learning tool.
最普遍的错误是你俯冲直英寸您选择一个主题，您认为它可能是相当风行，并会带来金钱。
The most general blunder is that you dived straight in. You selected a topic where you thought it might be quite all the rage and would bring in money.
最普遍的错误是你俯冲直英寸您选择一个主题，您认为它可能是相当风行，并会带来金钱。
The most general blunder is that you dived straight in. You selected a topic where you thought it might be quite all the rage and would bring in money.
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