But over the past eight years, as students spent more time in PE with certified instructors who helped them work on specific fitness skills--including social cooperation and teamwork--the scores began to tell a different story.

• 但在过去的八年中，随着学生与持证教员一起对体育投入时间的增加，教员们帮助学生不断提高特定的保健技能----包括社交合作和集体配合，成绩开始发生了变化。