have been cooling
Present perfect progressive conjugation of cool. There are other translations for this conjugation.

cool

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During the past 50 years, tropical and subtropical parts of three oceans have been cooling and warming by about 0.1°C, exactly in step with the 11-year solar cycle.
Durante los últimos 50 años las partes tropicales y subtropicales de tres océanos se han estado enfriando y calentando 0,1 O C, ajustándose perfectamente con el ciclo solar de once años.
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