Hi mingrui! The Minecraft game on mobile is a different version/platform. You need to purchase a Minecraft game license dedicated for PC. You can buy it from here //xbox/games/store/minecraft-java...

You can now purchase Minecraft: Bedrock Edition from the Google Play Store on Chromebook, which includes access to Minecraft Marketplace, and the ability to play on Realms. Minecraft is now available on compatible Chromebooks, including all Chromebooks launched in the last three years.