"To understand the mechanism" means to have a clear and knowledgeable comprehension of how something works, such as the process, system, or method behind it. Full definition
Overall, by understanding the mechanisms of search and data analytics, authors can better understand and engage with readers, as well as measure results and adjust their strategies accordingly. (publishingperspectives.com)
• Combine wind data with measurements from scientific instruments in other disciplines to help us better understand the mechanisms of global climate change and weather patterns. (oceanmotion.org)
Although longitudinal health surveys and large databases are excellent ways to determine the relative health risks associated with different behaviors, it doesn't mean that scientists understand the mechanisms behind those risks. (seeker.com)