Yet there is no culture of teaching language to primary-school students in the U. s., at least outside progressive private schools on the coasts.
然而，美国的小学，至少是沿海地区逐渐向私立过渡之外的那些学校，没有语言教学文化。
2
Primary biliary cirrhosis (PBC), which is an early form of liver cirrhosis, is a long term progressive autoimmune disease, in which environmental factors are thought to play a part.
This article provides a classification of primaryprogressive aphasia (PPA) and its 3 main variants to improve the uniformity of case reporting and the reliability of research results.