单语范例（未经PONS编辑处理）
He had finally solved the most difficult practical problems of talking movies.
en.wikipedia.org Before action could be taken, certain practical considerations had to be addressed.
en.wikipedia.org However, they resist putting energy into things that don't make sense to them, or for which they can't see a practical application.
en.wikipedia.org The first practical use was in the summer of 1921.
en.wikipedia.org They have to undergo rigorous training (both practical and theoretical) usually for 35 weeks.
en.wikipedia.org