skin depth

例句：

1. 1.The skin depth of the soil is an important factor in determining its fertility.
   土壤的表皮深度是决定其肥力的一个重要因素。
2. 2. The scientist measured the skin depth of the ocean using a sophisticated instrument.
   科学家使用一种复杂的仪器测量了海洋的表皮深度。
3. 3. The study found that the skin depth of the ocean had increased due to human activities.
   研究发现，由于人类活动，海洋的表皮深度增加了。