The idiom is the most popular among college girls in the dormitory.

[World Network unmanned aerial channel reporter Zhao Hanqing] recently, a number of social media users have seen a man - operated unmanned aerial vehicle in front of the window of a university's "Princess Lou" (a girl's dormitory) in a university in Wuhan. Time is the night when everyone is washing and preparing for bed.
Reading the related news will find many similar things. In May 2017, there was a drone on the window of a college girl's dormitory in a university in Hefei. The same time was in the evening. In addition, Chengde, Guangzhou, Xiamen... Community residents reported that there was a UAV appearance outside the window.
Malicious or unintentional?
After these events have caused a hot discussion on the Internet, many netizens expressed their indignation. They thought that the unmanned aerial vehicles (UAV) were secretly photographed in front of the window, especially when they were in bed at night.
But there are voices that think it may just be unintentional passing, and the ordinary aerial drone lens is so far away that it can't picture anything clearly. Both sides argue and say everything.
The incident in Wuhan subsequently passed out a letter of apology without a official and unsigned, called a test flight, and did not stay and shoot the "Princess tower". However, the World Wide Web UAV channel did not find this announcement on the school's official website or official micro blog. This announcement did not end the discussion between the two sides of the public opinion.
The final results of the two incidents in Hefei and Xiamen were all test flights and no shooting, and the results of the survey did not end the fear of privacy leaks by many residents.
Liable to lay oneself open to suspicion
Intentionally photographing or unintentionally? Neither side has persuaded anyone, but one view has quoted an idiom: Li Tian Xia, the majority of the arguments that quote this idiom are not rebuttal.
On the data, this idiom comes from "gentleman's trip": "gentlemen are not in danger, they are not suspected, they are not in the field. It means: after the melon field, do not bend over to pick up shoes; do not put up your hands to arrange the hat under the plum tree, so as to avoid the suspicion of provoke no suspicion.
"If you really want to be trusted, you can ask for advice before the experiment, or a girl's representative who invites the site at the same time to watch the supervision at the same time," he said. After the whole event, I saw countless opportunities to relieve the misunderstandings, but unfortunately, the student did not take advantage of any of the points.
The world network unmanned aerial channel thinks that this statement is very reasonable, our UAVs, of course, can not be used for malicious use, but also to try to avoid being doubted by others.