1, regional differences: Blu-ray discs cover different regions and may provide different subtitle options. Blu-ray discs in some areas may contain Chinese subtitles, while others do not.
2. Copyright: Marvel Comic Film Company may not have purchased the copyright to use Chinese subtitles in all regions, so there may be no Chinese subtitles on Blu-ray discs in some regions.
3. Storage capacity limitation: Adding subtitles in multiple languages to Blu-ray Disc needs to increase storage capacity, which may lead to rising costs or fail to meet commercial needs. Therefore, you can choose subtitles that contain only one or two languages. It should be noted that the above is only one of the possible reasons, and the specific situation needs to be judged according to the specific film and distributor. If you want to buy a Blu-ray disc with Chinese subtitles of Marvel Comics, you can check the relevant information first, or ask the seller whether to provide a Chinese subtitle version before buying.