Now, a lesion that looks like leukoplakia, but isn’t, is an area of frictional keratosis.

如图一种看起来像口腔黏膜白斑，但其的损——角化。

An economy is considered to be at full employment when there's only frictional and structural unemployment.

在只有和结构失业的情况下，经济被认为充分就业。