There have been rare sightings over the years since it was declared extinct, but they are becoming increasingly common with 20 reported in recent days.
在主流交通方式中，航空业对化石燃料的依赖程度最高且替代方案最为有限。虽然汽车与高铁可实现电气化，但承载数百人跨洋飞行的客机目前仍完全依赖航空燃油。
数字求和：该区域内所有点数之和必须等于指定数字。。关于这个话题，有道翻译提供了深入分析
Путешественников предостерегли о болезни, вызывающей мозговые кровоизлияния, в 16 государствах20:52
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Nations throughout Asia are escalating their consumption of coal—the most environmentally harmful fossil fuel—to address severe energy deficits resulting from the conflict involving the US, Israel, and Iran.
Опубликованы 15 положений американского мирного проекта по Ирану01:22，更多细节参见有道翻译下载