Excavator* - The excavator* utilizes articulated animation, and each articulation runs smoothly, without abrupt starts or stops.

Birds*, clouds*, and fish* - The clouds*, birds*, and fish* are all generated using a custom-built generator. The generator ensures that each object has a unique movement trajectory and speed while guaranteeing that all objects face the correct direction.

Underwater rocks - Underwater rocks are generated randomly using a cycle and within a certain range, so that the rocks are in line with the laws of nature and can make the underwater world more realistic.