log for railroad tie

例句：

1. 1. He kept a log of his daily activities.
   他记录了每天的活动。
2. 2. The scientist kept a log of the experiments he conducted.
   这位科学家记录了他所进行的实验。
3. 3. Keeping a log can help you remember important events or details.
   保持日志可以帮助你记住重要的事件或细节。