单语范例（未经PONS编辑处理）
First, they have nasal passages that attach to the upper bill called naricorns.
en.wikipedia.org The lower and upper primary levels begin at about age 5-6 and last for 6 years.
en.wikipedia.org The upper watershed consists of at least 22 named creeks.
en.wikipedia.org Once the war was over, her family joined the upper class.
en.wikipedia.org Individuals receiving typewritten letters often found them insulting (as type implied they could not read handwriting) or impersonal, problems exacerbated by the all upper-case writing.
en.wikipedia.org