使用 Firestore 调用 Firebase 服务

Firebase 是一个用于开发 BaaS 应用的开发平台，它提供了诸如实时数据库、云存储、鉴权、Crash 上报、机器学习、远程配置以及托管你的静态文件等后台托管服务。

Firebase is a Backend-as-a-Service (BaaS) app development platform that provides hosted backend services such as a realtime database, cloud storage, authentication, crash reporting, machine learning, remote configuration, and hosting for your static files.

Firebase 可以支持 Flutter，如果你想获取更多信息，可以查阅下面这些链接：

Firebase supports Flutter. For more information, see:

当然，Flutter 社区也创建了一些可能会对你有用的文档：

Also, the Flutter community has created docs and videos that you might find useful. Here are a few: