It is usually used to describe the number of engines of an aircraft."Double engine" refers to two engines.
The so-called "single engine" refers to the special situation in which the twin engine aircraft has some special conditions that cause the failure of one engine, leaving only one engine for flight.For an aircraft, it is not easy to fly and land safely in the "single engine" state. If it is handled improperly and the weather is bad, adverse consequences are likely to occur.
Medical Terminology
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Compared with multiple lesions, it refers to only one lesion, while multiple lesions refers to three or more lesions.
