The s train is not only physical, there’s also the psychological burden.

细究起来，这种吃力不仅是体力上的，更主要的是心理上的。

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This sense of safety is not only physical, but also psychological and mental.

这种安全意识不仅是生理上的安全，而且是心理上和精神上的安全。

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There is not only physical space but the psychological dimension in which thought covers itself - as yesterday, today and tomorrow.

不仅仅存在物理空间，还有心理上的维度，思想在其中用昨天、今天和明天来掩饰自己。

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"It's not only physical care the old need, " she explains.

CNN: Alone in the Big City

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

Not only do these physical meetups provide members with a dose of collective oxytocin, but they feed a vital feedback cycle for the company that any tech startup would covet.

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