单语范例（未经PONS编辑处理）
The problems are two-fold: the drop in numbers of pure-bred wildcats (almost none left); and cross-breeding with local tabbies and feral cats.
www.heraldscotland.com Many of them are pure-bred and cross-bred and would have cost a few hundred euro to buy as a pup.
www.clarechampion.ie It isn't known if they were pure-bred shih tzu or crossed with another toy dog breed.
www.odt.co.nz Seventeen of the twenty species of dragonfly recorded are known to have bred.
en.wikipedia.org The two cats bred, producing four kittens born in 1981 that were so adorable that a new breed was born.
en.wikipedia.org