How to change apt-get source.list from CD-ROM to Mirror-Site for Debian 8.2 Jessie－雜七雜八的小筆記!

We will change as follows,

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deb cdrom:[Debian GNU/Linux 8.2.0 _Jessie_ - Official amd64 DVD Binary-1 20150906-11:13]/ jessie contrib main

# deb http://security.debian.org/ jessie/updates main contrib
# deb-src http://security.debian.org/ jessie/updates main contrib

# jessie-updates, previously known as 'volatile'
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb http://ftp.debian.org/debian/ jessie-updates main contrib
# deb-src http://ftp.debian.org/debian/ jessie-updates main contrib
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to

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#deb cdrom:[Debian GNU/Linux 8.2.0 _Jessie_ - Official amd64 DVD Binary-1 20150906-11:13]/ jessie contrib main

# deb http://security.debian.org/ jessie/updates main contrib
# deb-src http://security.debian.org/ jessie/updates main contrib

# jessie-updates, previously known as 'volatile'
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb http://ftp.debian.org/debian/ jessie-updates main contrib
# deb-src http://ftp.debian.org/debian/ jessie-updates main contrib

deb http://ftp.tw.debian.org/debian/ stable main contrib
deb-src http://ftp.tw.debian.org/debian/ jessie-updates main contrib
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