dumb well

例句：

1. 1. The engineerdug a dumb well to test thesoil's strength.
   工程师挖了一个哑井来测试土壤的强度。
2. 2. The childrenwere playing in the dumb well when theirparents called them home.
   孩子们在哑井里玩耍，当他们的父母叫他们回家时，他们才意识到。
3. 3. Thedumb well was filled withwater and could not be seenfrom the surface.
   哑井被水填满了，从表面看是看不到的。