The demonstration describes the structure of a basic water filter and how it processes to generate drinkable water.
In the overview, the water-filter assembly composes of two different parts: one is designed to clean the water and the other is for storing safe water.
Examining the first part of the machine, there is a plastic barrel with a multi-layers filter
inside it. This filter
consists of three major layers made from different materials: the top layer is sand, the middle layer is charcoal and the bottom layer is gravel. The second part is simply a large plastic bottle arranged slightly lower than the first one. The two get connected through a tube, with one of its ends locates at the bottom of the filtering part.
When water is poured into the first barrel,
it gradually passes through the three-layers filter and
sinks at the bottom. Clean drinking water is then
drawn into the second one through the tube. After that, people can drink the liquid stored inside this barrel.
The use of mobile phone is as antisocial as smoking. Smoking is banned in certain places so mobile phone should be banned like smoking. To what extent do you agree or disagree?
It is highly controversial whether the use mobile
phones should be considered as antisocial and be
restricted in
specific places. In my opinion, I strongly disagree this perspective.
To begin with, it is worth considering why some people hold such beliefs. Technological development has created a digital world where users can get access to plenty of entertaining resources with just a few clicks.
Consequently, people increasingly prefer getting another dopamine hit
through their phones and internet access rather than
engaging in deep, meaningful conversations with those around them.
Strangely enough, some young people even admit that their phones have become an extension of their bodies.
In response to this trend, some special coffee shops
prohibit phones and tablets usage, and visitors
intentionally choose these places to have meaningful conversations with their friends.
However, this type of behavior should not be
equated with smoking for
a variety of reasons. Firstly, one using their phones does not negatively effect the health of surrounders, though it might be irritating if that person is a member of your group engaging in certain activities together. On the other hand, it is reported that frequently
exposure to smoke increases one's
risk of health problems. Secondly, the increasing demand for digital apps, such as digital payments, emailing or finding directions, is undeniable. Therefore, banning people from using their phones in certain places is not appropriate and will only discourage them coming to such areas.
In my opinion, the use of mobile phone should not be considered as antisocial and should not be forbidden. However, one should control their usage time and pay attention to people around them.