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.

一也颇为棘手，因为许多降低其水平的因素，若期作用， 会使身体更擅制造它， 反而减少了酯酶的生成。