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Surgery [a] is a medical specialty that uses manual and instrumental techniques to diagnose or treat pathological conditions (e.g., trauma, disease, injury, malignancy), to alter bodily functions (e.g., malabsorption created by bariatric surgery such as gastric bypass), to reconstruct or alter aesthetics and appearance (cosmetic surgery), or to remove unwanted tissues (body fat, glands, scars ...
British Rail Class 55 Deltic diesel locomotive with their characteristic dense exhaust when starting a train.. Diesel exhaust is the exhaust gas produced by a diesel engine, plus any contained particulates.