7月20日，今年“三伏”的大幕正式开启，全国多地将进入持续高温模式，一般以“桑拿天”为代表。专家表示，2015年至2024年，连续10年的“三伏”都是40天，到了今年，这一纪录将被终结。今年“三伏”时长30天。
新华社音视频部制作
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