user actions的用法和样例：
例句
- Launch assistive technologies at login time by associating a user action with an assistive technology application.
登录时启动辅助技术，联接用户动作和辅助技术应用程序。 - It emulates user actions to ensure that execution paths operate correctly and the appropriate responses are returned for the given requests.
它模拟用户动作来保证执行路径操作正确，并对给定的请求给出合适的反应。
