只在此山中，云深不知处。
Only in this mountain , the clouds deep know .
研究者认为，恋人们本身之所以不能准确地预测自己恋情的发展，正是应了“只在此山中，云深不知处”这句话。
The reason for this may be that couple members have a " tremendous personal stake in the romance that clouds ( their ) judgments regarding it ," the researchers suggest .
云深不知处