The first responder to the accident was a paramedic.

事故的第一回应者是一名护理人员。

Seriously? first responder shooting to President Lincoln?

他就是林肯总统遇害后的第一急救人？

Notifies the receiver that it's been asked to relinquish its status as first responder in its window.

让调用对象在当前窗口失去事件首对象状态。