"必由之路" means what we have to do before we reach the gaol. Usually, the gaol needs your efforts.I mean, you must willing to do it. Now you are forced to stay home, so it's not what you'd like to do.
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March 8, 2012
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Usually it depends on the next word. 'Nan' is only pronounced before some special words like 'の', 'です' and 'と'.