transient curve

例句：

1. 1.The transient sun sets in the sky every day.
   太阳每天在天空中短暂地升起。
2. 2.He was a transient visitor to the city.
   他曾经是这座城市的临时居民。
3. 3.The transient nature of life makes it difficult to plan for the future.
   生活的短暂性质使得为未来做计划变得困难。