Drone-flyers are breaching both no-fly zones and restricted airspace around airports with increasing frequency.

无人机驾驶员们既违反禁飞区规定，也违反机场附近的限制飞行规定，而且违规事件越来越频繁。

Similarly to the restricted airspace, however, these are designated on aeronautical charts by the letter P followed by a dash and a number.

然而，与限制空域类似，这些空域在航空海图上用字母 P 表示，后跟破折号和数字。

Unidentified aircraft, you are in restricted US military airspace.

不明身份的飞机 你现位于美军管制空域。

This might be to better communicate with other towers, or perhaps required if entering restricted airspace.

这可能是为了更好地与其他塔进行通信，或者在进入受限空域时可能需要。