Let us undergo anything by using a scenario situation. But right before that, let's mention some OOP principles. @MarkusMeskanen: since the item is immutable, and when you mutated it set up you could potentially not specialise it in the subclass. 宋晓东报告了项目总体任务、技术路线和工作安排。项目分解为四个课题，分别为大震震源区精细结构与应力模型、大地震全过程仿真以及危险源识别、大地震... https://topresidentialprojectsingurugram.wordpress.com/2025/09/13/4s-the-aurrum-sector-59-gurgaon-luxury-living-redefined-on-golf-course-extension-road/