Couples who had just fallen in love had significantly higher levels of nerve growth factor, or NGF.
刚刚坠入情网的恋人明显有较高水平的神经生长因子。
Jane fell in love with him a long time ago, but she never had the nerve to tell him.
珍很久以前就爱上了他，但她却从未有勇气向他告白。
The protein molecule known as the nerve growth factor has high levels when people first fall in love, but these return to previous levels after one year .
当人们最初相爱的时候，被称作神经生长因子的蛋白质分子处于较高的水平，但一年之后回复到之前的状态。
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