heatwaves
n.
热浪[波]，酷暑期( heatwave的名词复数 );
例句:
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Elsewhere, it expects more floods, droughts and heatwaves.
来自VOA
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Because of the increased demand for air-conditioning during heatwaves, consumption of electricity rises.
来自BBC
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However heatwaves over europe over the past three decades just happened to coincide with Solar maximum.
来自SA