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.

白宫惊降落无人，特工在北面草坪发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.

这是架四角直升，迪拜的实验不是发放交通罚单，而是更多的是搜索和救援的事情。