What does in mean here, followed by the specific content.

The second sentence means that what you see in the standardized classroom is the same as most things you see on the Internet, that is, online teaching is as formal as usual ~ Hehe

The passage of time means opportunity. That is to say, their chances of finding a job in this way are only 15%.

The last one is not to send a copy of your resume, which means the original.

Yes done ..