The authors believe it was probably caused by heat emanating from the optical drive.

编者相信这应该是由于光驱散发的热量。

youdao

The projected image resembles a Chinese landscape painting, but it actually is the image of a wire that changes its position with the heat emanating from the projector.

投射出的影像看似一幅中国山水画，但实际上是一根随投影仪发出的热而改变位置的铁丝的影象而已。

youdao

The second half lacked the you-score, we-score, theatre of the opening 45 minutes but as the match moved into the final 20 minutes of normal time, the players started to tire in the heat and there was an increasing sense of anxiety emanating from the stands.

BBC: Blackpool 3-2 Cardiff

But the FF, inching through the stultifying heat for hour after hour, behaved impeccably: no glitches, no coughs, no smell of burning flesh emanating from the vents.

BBC: Cruising around northern Italy