Internal Combustion Engine

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ignite = to (cause to) start burning or explode

combustion = the process of burning something

chamber = an enclosed space

sump = a hole or container, especially in the lower part of an engine, into which a liquid that is not needed can flow

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.