They convert matter into energy when they burn fuel to produce heat or electrical power for example.
(They; convert matter; into energy; T:when they burn fuel to produce heat or electrical power for example) (they; burn; fuel; to produce heat or electrical power for example) Context(they burn,List([37, 46))):(they; burn fuel to produce; heat or electrical power; for example)
they burn,List([37, 46))
They they they
convert matter burn burn fuel to produce
into energy T:when they burn fuel to produce heat or electrical power for example
fuel to produce heat or electrical power for example
heat or electrical power for example