The researchers checked the cholesterol levels of more than 3,600 British civil servants and gave them memory tests at an average age of 55 and again at 61.

• 研究人员们检查了胆固醇水平超过3,600的英国公务员，并且在平均年龄55岁时以及再次在平均年龄61岁时给他们进行记忆测试。