have been cooling
Present perfect progressiveconjugation ofcool.There are other translations for this conjugation.

cool

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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