Two times.
You should brush your teeth twice a day.
Doubled in quantity, intensity, or degree.
Thus it appears that if the machine is turning twice as slow as before, there is more than twice the former quantity in the rising buckets; and more will be raised in a minute by the same expenditure of power.
From earlier twise, from Middle English twies, twiȝes, from Old English twīġes (“twice”), from twīwa, twīġa ("twice"; whence Middle English twie (“twice”)) + -es (adverbial genitive ending). Related t...
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