Anglais example sentences with "barometers"

Public opinion polls are barometers of confidence in the government.
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For instance, gauges, such as thermometers and barometers, are instruments.
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The lowest-tuned pipe on the organ set off barometers all over the state.
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Is it true that amphibious creatures are barometers or indicators of the health of the planet?
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Stock markets are viewed as barometers providing early warnings of future trends in economic activity. If that is so, are the markets telling us that a new recession is around the corner?
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