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.

一氧化氮也颇为手，为许多降低其水平的素，若期作用， 会使身体更擅制造， 减少了磷酸二酯酶的生成。