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"James Watt invented the steam engine, which substituted machine power for human power." I've read this phrase, and thought "that can't be worded right, it ought to be 'substituted human power for machine power,' as in 'substitute this for that." Is the phrase worded correctly, or am I gone and crazy?

BenjaminF
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"Substituted X for Y" means removed Y and replaced it with X. The sentence means that the steam engine removed human power and replaced it with machine power.