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1.Hundreds of huge wildfires have broken out all across the Arctic Circle.
break out 爆发
He was 29 when war broke out.
战争爆发时他才29岁。
2.and warmer conditions encourage fires to grow and persist once they have been ignited.
persist 持续
If the symptoms persist, consult your doctor.
如果症状持续不消除，就得去看医生。
