bottoming hand tap

例句：

1. 1.The workers are bottoming the foundation of the new building.
   工人们正在挖掘新建筑的基础。
2. 2.The farmer bottomed a well for water supply.
   农民挖了一口井以获取水源。
3. 3.The scientist bottomed out the chemical reaction.
   科学家揭示了化学反应的真相。