In a manner involving both electrical and pneumatic systems or principles.
From electropneumatic with the adverbial suffix -ally, indicating the manner or way something happens using both electrical and air-pressure components.
When engineers describe a system as working 'electropneumatically,' they're saying it's a clever combination—electricity controls pneumatic power, which is like using your brain (electricity/neural signals) to control your breathing (pneumatic/air pressure).
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