has cackled
Present perfecthe/sheconjugation ofcackle.

cackle

But Berg has cackled gleefully about how it's the percentage of CO in exhaust that determines lethality, not total volume. (An oversimplification, by the way - there are other factors such as pressure.)
Pero Berg ha parloteado incesantemente sobre cuál es el porcentaje de CO en el escape que determina la muerte, despreciando el volumen total (por cierto, una simplificación excesiva- hay que tener en cuenta factores como la presión).
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