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Machine | Definition, Mechanisms & Efficiency | Britannica
Machine Definition & Meaning - Merriam-Webster
Machine - Wikipedia
MACHINE Definition & Meaning | Dictionary.com
Simple machine | Definition, Types, Examples, List, & Facts
MACHINE | English meaning - Cambridge Dictionary
Machine - Wikiwand
MACHINE | definition in the Cambridge Learner’s Dictionary
machine summary | Britannica
Simple machines and how to use this tutorial - Khan Academy