If you want to remember your dream by the way keep your dreams--keep a dream diary, very useful, but everybody dreams three to four times a night.

如果你想记得自己梦见什么,那就写一本梦境日记，这是非常有用的，每个人平均一晚作三四次梦。

耶鲁公开课 - 心理学导论课程节选

After careful screening, volunteers will be inoculated and asked to keep a diary on how they feel.

CNN: School: No shortage of volunteers for swine flu vaccine trials

People living in a seaside resort are being asked to keep a diary noting whenever they smell sewage.

BBC: Ingoldmells residents asked to keep odour diaries

Working with 400 school children aged between nine and 11, the team assigned whole classrooms either to perform and note down three kind acts per week or - as a control group - to keep a diary of three locations they visited each week.

BBC: Kinder children are more popular