Abstract: This application discloses a projection system, method, and apparatus, a storage medium, and a computer program product, and belongs to the field of computer technologies. The method includes: A source device sends a UI structure and UI attribute data of a projection area to a destination device. In this way, the destination device can construct, reconstruct, render, and display a corresponding projection area based on the UI structure and the UI attribute data at a UI layer. In this solution, the source device does not need to perform video encoding and transmission after rendering an image, thereby reducing power consumption of the source device. The source device does not need to send user-related data to the destination device, thereby reducing a risk of leakage of user privacy data.

Abstract: Disclosed in the present invention is a fishway effect evaluation method based on stable isotope method, belonging to the technical field of fishway effect evaluation. The fishway effect evaluation method according to the present invention comprises stable isotope ratio determination, trophic niche estimation and effectiveness evaluation on fishway construction. The evaluation method according to the present invention is used for researching one or more migratory fishes in the upstream and downstream of the water conservancy projects, determining and quantitatively explaining whether the influence of the water conservancy projects on one or more migratory fishes is eliminated or not from the perspective of the ecosystem through comparison and analysis of stable isotopes, and has the characteristics of high detection speed, stable result and the like.