t is said that "Not everything that is learned is contained in books". Compare and contrast knowledge gained from experience with knowledge gained from books. In your opinion, which source is more important? Why?

Concerning the issue whether scientists should use
living
Suggestion
live
animals for scientific
research
, people hold different views. Some people claim that it is cruel, while some other people argue that it is beneficial to the development of science. As far as I am concerned, I am in favour of carrying out experiments on animals.
Firstly
, scientists can do initial experiments on animals to test the effect of a new
medicine
. Scientists have achieved so many milestones on the way to medical development. But they
can not
can not
cannot
find any effective treatment for some diseases yet, like cancer and AIDS, which are fatal to people's health. Through experiments on animals, scientists can not only understand the pathology of some
diseases but
Accept comma addition
diseases, but
also
try the effect of
medicine
and find the most effective treatment for these diseases, making a great breakthrough in the field of
medicine
.
Secondly
, using
living
Suggestion
live
animals in the laboratory, the teachers in the university or some
research
institutes can demonstrate the
anatomic
Suggestion
anatomical
knowledge to the students majoring in
medicine
, rendering students a direct understanding of biological knowledge, which can improve the level of medical
research
and make great contributions to the medical science. Without experiments on living animals, genetic technology would not have developed so quickly. Actually, most scientists attribute their success and breakthroughs to experiments on animals.
Finally
, Some animals can provide human beings with essential organs for transplantation. Genetic technology will change the genes of some animals. In the near future, organs of animals will take the place of artificial organs like
heart
a form of energy that is transferred by a difference in temperature
heat
pumps, prolonging
patients
Suggestion
patient's
patients'
life.
However
,
research
on living animals faces a moral problem because animals are
also
living which possess equal rights as human beings, according to many. On a
second
thought, it is worthwhile for the purpose to accelerate the development of science and the progress of human civilisation.
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    • Sentence 2 - Example
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    • Sentence 1 - Topic sentence
    • Sentence 2 - Example
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