log of freight train performance

例句：

1. 1. The engineer kept a log of the work done each day.
   工程师每天记录工作日志。
2. 2. She wrote her thoughts in a journal every night.
   她每晚都在日记本上写她的思考。
3. 3.The scientist kept a record of his experiments.
   科学家记录了他的实验。