And the reason for this, it turned out, after two or three years' work, was that in the skin we have huge stores not of nitric oxide, because nitric oxide is a gas, and it's released --  -- and in a few seconds it's away, but it can be turned into these forms of nitric oxide -- nitrate, NO3; nitrite, NO2; nitrosothiols.
经过两三年的工作，我们终于找出了原因， 我们皮肤里大量储存的并非一氧化氮 因为一氧化氮是气体 它要挥发的——（噗！) ——几秒钟就没影了， 但一氧化氮能转化成 硝酸盐、硝酸盐、亚硝酸盐、二氧化氮、亚硝基硫醇。