This is comparing how the angels abandoned their assigned work to people in Sodom and Gomorrah.
## and the cities around them ##
"and the other cities near them"
## in a similar way gave themselves over ##
Sodom and Gomorrah gave themselves over to sexual immorality the same way as the angels gave themselves over to following evil.
## over to fornication and pursued unnatural desires ##
People were having sex outside of marriage. Also men were having sex with men and women were having sex with women.
## They were given ##
"The people of Sodom and Gomorrah were given"
## as examples of those who suffer the punishment of eternal fire ##
The destruction of the people of Sodom and Gomorrah became an example for the fate of all who reject God.
## these also pollute ##
"These" refers to people who reject God who pollute their bodies with sexual immorality the same way throwing garbage into a stream can cause the water to be bad to drink.
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