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Use "plateaux" in a sentence
"After varying numbers of repetitions, depending somewhat on the particular individual, there occur what are known as "plateaux," during which no progress in speed or accuracy of response is to be observed."
"These "plateaux" of learning are sometimes to be accounted for by muscular fatigue."
"They crawled and climbed and scrambled over high ethical plateaux and ranges, or drowned themselves in metaphysical seas of sentimentality."