what does "instant messenger" refer to? Hello, "Messenger" means a person who gives a message to sb or who delivers messages to people as a job . I suppose that "instant messenger" could mean online communicating tool, such as Wechat, Line, or Skype, etc. where people can communicate with each other. Is that right? Thank you.

What does the progress of human science development refer to? Hello, Here is a sentence. "To respect the elderly is also the progress of human science development. " 1. What does the progress of human science development refer to? Could you give me an example? 2. Could I say "Respecting the elderly is also the progress of human science development"? Is there any difference from the original one? Thank you.

Question about "being content with sth" Hello, "Lending a helping hand for no reward is another form of volunteering. It’s also about being content with a simple and humble way of life." Could I rephrase the second sentence like "Lending a helping hand for no reward also reflects that you are content with a simple and humble way of life"? Thank you.

how to use ""be located by + a place"? Hello, Could I use "It is located by a hill/ river/building" to refer to "it is located near a hill/river/building"? How about "be located in/on/at/to+a place"? I suppose that "be located in + a place" is used when the place is big, like a country, a city, a town;"be located at +a place" is used when the places are smaller than those places just mentioned; "be located on+a place" is used when the place is a street, island. Does "be located to+a place" mean the same thing as "be located by +a place"? Thank you.

Does "various areas" refer to " writers, economists, scientists, composers and actors"? "There are also many other famous senior and junior members of the University in various areas, such as writers, economists, scientists, composers and actors." Hello, I'm not quite clear about the relationship between "such as" and its previous part in the above sentence. Does "various areas" refer to "writers, economists, scientists, composers and actors"? Or "writers, economists, scientists, composers and actors" should be the example of "famous senior and junior members"? Thank you.