Scientists have warned that July 4 celebrations across the US risk accelerating the spread of the Delta variant of Covid-19, particularly in parts of the country where vaccination rates have lagged.
科学家警告称,美国各地7月4日的庆祝活动可能会加速新型冠状病毒德尔塔变种的传播,尤其是在该国疫苗接种率落后的地区。
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