simple steam-engine

例句：

1. 1. The house issimple and cozy.
   这所房子简单而舒适。
2. 2. The design is simple yet elegant.
   设计既简单又优雅。
3. 3. The task was too simple for him to be challenged.
   这个任务对他来说太简单了，无法挑战他。