Now, a lesion that looks like leukoplakia, but isn't, is an area of frictional keratosis.
如图种看起来像口腔黏膜白斑,但其实病损——擦性角化。
The implication is that such unemployment as exists at any time is due wholly to the fact that changes in demand conditions are continually taking place and that frictional resistances prevent the appropriate wage adjustments from being made instantaneously'.
这意味着任何时候都存在这种失业完全由于需求条件断发生变化以及擦阻力阻止立即进行适当工资调整这事实造成。