Nitric oxide is kind of difficult too, because a lot of things that decrease it, if you take it long enough, your body will become better at making it and actually make less phosphodiesterase enzymes.

一氧化氮也颇为棘手，为许多降低其水素，若期作， 身体更擅制造它， 反而减少了磷酸二酯酶生成。