過客 Passenger

人類是大自然的過客

I read the above sentence, it said human beings are passengers of the nature.

This morning, when I was having a morning walk in the hill side, I breathed the fresh air, enjoyed the nature, I also have a deep understanding of this sentence.

Long time ago, people visited this place before, but now they may not be in the world any more, but the place is still here, from past, to present, and also for the future. It is only us, we are just passengers at this moment of time.

Suddenly, I think we are also the passengers of time.

Time is like a train, it has a on-going journey, we get in the train, and one day, we get out the train.