Think of it as a cloud copter.

把它想象成架直升。

And the White House got a surprise landing after secret service agents discovered a 2-foot quad copter on the north lawn.

白宫惊现降落无人，特工在北面草坪发现了架两英尺长的四引擎直升。

This is a quad copter that Dubai's experimenting with not to give out traffic tickets but more for things like search and rescue.

架四角直升，迪拜的实验不发放交通罚单，而更多的搜索和救援的事情。