there isn't a such thing "平趟着睡觉," there is no up and down.
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送交者: steven 于 2012-06-16, 14:55:59:
回答: 在失重状态下可以不用平趟着睡觉, 这样就没有舌根后坠的问题了 由 blackbox 于 2012-06-16, 14:51:52:
There is nothing to pull the tongue back regardless how people sleep.
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