natural level meaning in English

天然水准面

But three uv filters which are widely used in sunscreens actually generate ros in skin themselves when exposed to ultraviolet radiation - adding to the natural level
但3种被广泛地应用于防晒用品里的滤光剂，实际上在紫外线照射下，产生了ros作用，超出了自然状态下的水平。
A practical way to overcome this difficulty is to use the so - called " natural level function " as the merit function instead of the general level function
此时newton方向是自然水平函数的最速下降方向。因此，利用自然水平函数进行搜索，可以增大算法的步长，达到提高算法效率的目的。
Finally , electronic components capable of withstanding the high radiation levels of a hane ? about 100 times as great as natural levels ? offer functional bandwidths only about one tenth the size of those offered by commercially available processors , a fact that can raise operating costs by an order of magnitude
最后，可承受高空核爆高剂量辐射（约为自然剂量的100倍）的电子元件，运作频宽仅为商品化处理器运作频宽的十分之一，因此又将使用成本增加了一个零。