So we thought we'd just kind of model -- Different amounts of UV hit different parts of the Earth at different times of year, so you can actually work out those stores of nitric oxide -- the nitrates, nitrites, nitrosothiols in the skin -- cleave to release NO.
我们认为我们只是一种模型-- 不同时节照射到不同地域的紫外线是不等的 所以，你其实可以 将皮肤里的硝酸盐、亚硝酸盐、还有亚硝基硫醇 分解得到一氧化氮