Nowadays, there is an increase in the number of people who express concern regarding the effective way to cope with criminals. However, it is a controversial issue that people should educate and do some job training for the offenders rather than send them to jails. From my perspective, I just partly agree with this opinion because of the following reasons.
Firstly, I strongly believe that the main function of prisons is punishing the criminals. Because individuals have to be responsible for their behavior, offenders have to receive suitable punishments for the crime that they committed. Therefore, dispossessing criminals from freedom until they feel regret for what they did is necessary.
Secondly, jails play an essential role in ensuring the public security. To be specific, severe punishment such as life imprisonment is an effective way to stop and prevent the number of criminals from appearances. For example, robbers pose a serious threat to public safety so they need to be isolated from society until they could distinguish right from wrong. Additionally, It is also the best way to calm the public opinions, especially the pains of victims.
Nevertheless, it is not to say that we should ignore the prisoner's opportunities to come back to society. In this case, educating and job training are effective tools to support them become people who can make contributions to society. However, this way is only right when they can recognize their mistakes.
In conclusion, although there are some doubts about the jail's functions, I still believe they play an indispensable role in society. 
Nowadays, there is an increase in the number of  
people
 who express concern regarding the effective way to cope with  
criminals
.  
However
, it is a controversial issue that  
people
 should educate and do  
some
 job training for the offenders  
rather
 than  
send
 them to jails. From my perspective, I  
just
 partly  
agree
 with this opinion  
because
 of the following reasons. 
Firstly
, I  
strongly
 believe that the main function of prisons is punishing the  
criminals
.  
Because
 individuals  
have to
 be responsible for their behavior, offenders  
have to
 receive suitable punishments for the crime that they committed.  
Therefore
, dispossessing  
criminals
 from freedom until they feel regret for what they did is necessary. 
Secondly
, jails play an essential role in ensuring the public security. To be specific, severe punishment such as life imprisonment is an effective way to  
stop
 and  
prevent
 the number of  
criminals
 from appearances.  
For example
, robbers pose a serious threat to public safety  
so
 they need to  
be isolated
 from  
society
 until they could distinguish right from  
wrong
.  
Additionally
, It is  
also
 the best way to calm the public opinions,  
especially
 the pains of victims. 
Nevertheless
, it is not to say that we should  
ignore
 the prisoner's opportunities to  
come
 back to  
society
.  
In this case
, educating and job training are effective tools to support them become  
people
 who can  
make
 contributions to  
society
.  
However
, this way is  
only
 right when they can recognize their mistakes. 
In conclusion
, although there are  
some
 doubts about the jail's functions, I  
still
 believe they play an indispensable role in  
society
.