在Adaptive Card中使用Teams标记可以通过以下三步来实现：

1. 在Adaptive Card中添加对应的字段。例如，在JSON格式的Adaptive Card中添加以下字段：

{ "type": "TextBlock", "text": "Hello [@Team1], please complete the task by tomorrow." }

2. 在调用发送消息的API时，将Teams标记作为一组键值对嵌入到相应的属性中。例如，在Node.js中使用Microsoft Teams的Bot框架时，可按以下方式添加Teams标记：

const text = Hello ${teamId}, please complete the task by tomorrow.; await turnContext.sendActivity({ type: ActivityTypes.Message, text: text, entities: [ { type: "mention", mentioned: { id: teamId, name: "Team1" }, text: "@Team1" } ] });

3. 在团队中显示的消息中，Teams标记将自动转换为对应的团队名称。

示例代码：

{
  "type": "AdaptiveCard",
  "body": [
    {
      "type": "TextBlock",
      "text": "Hello [@Team1], please complete the task by tomorrow."
    }
  ],
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.0"
}

const text = `Hello ${teamId}, please complete the task by tomorrow.`;
await turnContext.sendActivity({
  type: ActivityTypes.Message,
  text: text,
  entities: [
    {
      type: "mention",
      mentioned: {
        id: teamId,
        name: "Team1"
      },
      text: "@Team1"
    }
  ]
});