1. The Mississippi River watershed drains directly into the Gulf of Mexico, where dead zones frequently occur. 密西西比河流域排水沟直接进入墨西哥湾，在那里死亡区经常出现。
2. A hybrid strategy based on watershed transformation is proposed and applied to bone marrow cell image segmentation. 提出了一种混合的分水岭变换策略并应用于骨髓细胞图像分割中。
3. Field and laboratory experiments were conducted to research the phosphorus adsorption by the pond sediments in the pond system in a headstream watershed. 本实验以一个源头小流域的水塘系统为例，研究了位于不同土地利用中的水塘沉积物磷吸附特征。
英英解释
n.
1. a ridge of land that separates two adjacent river systems
2. an event marking a unique or important historical change of course or one on which important develop
