Outlined by rays of sunlight known as crepuscular rays, they are actually shadows cast by clouds near the distant western horizon, the setting sun having disappeared from direct view behind them.

在被称为曙暮辉的太阳光线的照射下，它们实际上是由靠近遥远的西方地平线的云层产生的阴影，此时落日在云层的正后方渐渐隐去。

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In July, through the blue sky, the sun hung like fireballs, clouds as if the sun melted and disappeared Not the least trace was found.

七月，透蓝的天空，悬着火球似的太阳，云彩好似被太阳烧化了，也消失得无影无踪。

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The early morning sun was a blinding ball of fire in the sky, and the hot air shimmered as it rose off the long queue of fuel trucks that snaked the curve and disappeared over the rise beyond.

清晨的太阳像个火球般在天空中闪耀，炽热的空气在蜿蜒曲折的油罐车队上空飘荡，那车队的尾巴消失在远方的山坡后面。

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Sydney's summer sun has disappeared under a blanket of smoke so thick at times that iconic structures such as the Sydney Opera House and the harbour bridge could not be seen from the city centre, and flights have had to be diverted to other places.

ECONOMIST: Arson suspected