furrow bottom

例句：

1. 1. The farmer carefully dug a furrow in the field to plant his crops.
   农民小心翼翼地在田地里挖了一条沟来种植他的庄稼。
2. 2. The boat sank into the deep water, leaving only the furrow bottom visible.
   船沉入深水中，只有沟渠底部可见。
3. 3.The engineer used a laser to create a precise furrow bottom for the construction project.
   工程师使用激光精确地为建设项目创建了沟渠底部。