SCR systems can also use urea as a reagent, and it is becoming preferred to ammonia in many cases because of its safety.
Urea is safer than ammonia for SCR systems.
SCR systems cannot use urea as a reagent.
British Prime Minister John Major announced that the national election will be cancelled.
Emperor Divers has a bad reputation.
The biker is riding outside.
A man is next to water.
I stopped doing aerobics because it was painful.
A bunch of guys are on a boat.