Basking in the glow of the bright supergiant star Rigel, the Witch Head Nebula trails like a puff of smoke through the Eridanus constellation about 700 light years away.

在明亮的超巨星参宿七的照耀下，女巫头星云的尾部就像一阵烟，穿过700光年远的波江座。

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Analyses and compares the diffusion regularity of fire smoke with and without screen doors when fire occurs in the middle or head of the train separately.

分析比较了地铁列车中部和头部分别发生火灾情况下有、无屏蔽门时烟气的扩散规律。

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John's head was wreathed in cigar smoke.

约翰的脑袋笼罩在雪茄烟雾之中。

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The NTSB head said that Boeing's safety checks suggested that a smoke event would occur less than once every 10 million flight hours.

BBC: Boeing gets permission for Dreamliner test flights

"The failure rate was higher than predicted as part of the certification process and the possibility that a short circuit in a single cell could propagate to adjacent cells and result in smoke and fire must be reconsidered, " said Deborah Hersman, the head of NTSB.

BBC: Boeing gets permission for Dreamliner test flights

My recollection is of a small man with an outsized head, an upper-class British accent, and a swirl of cigar smoke around his face.

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