tracking device

• 跟踪器

tracking device的用法和样例：

例句

1. The Inventory Tracking sample shows how to use condition actions to allow subscribers to define their own query clauses for their subscriptions.
   库存跟踪器示例显示了如何通过使用条件操作使订阅方可以为其订阅定义自己的查询子句。