superficial deposits

例句：

1. 1. The surface of the lake is covered in a layer of algae.
   湖的表面覆盖着一层藻类。
2. 2.The superficial appearance of the painting hides its true meaning.
   这幅画的外表掩盖了它的真实含义。
3. 3. The researcher found that superficial changes could lead to significant long-term effects.
   研究者发现，表面的变化可能会带来长期的重大影响。