Our psychological present is three seconds.

我们心理上的当下是三秒钟。

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On the question of freedom in education there are at present three main schools of thought, deriving partly from differences as to ends and partly from differences in psychological theory.

关于教育自由的问题，目前主要有三大思想派别，其差异部分在于目的，部分在于心理学观念。

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While it will probably take at least another 20 years before Zubrin -- or anyone else for that matter -- makes it to the Martian surface, NASA and other space agencies are already drawing up plans for a voyage that will present astronauts not only with physical but also psychological challenges never faced by humans before.

CNN: Mars on the brain? Red Planet pioneers to face cosmic mind trip