In the firstone. black clouds of exhaust fume are emitted from a highchimney. to thes trend one. a signal tower stands instead ofthe ugly chimney. sending out invisible harmful radiation.

第二幅图中一座信号塔取代了丑陋的烟囱。放射出无形的有害辐射。

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Black fume billowed from its exhaust pipe as the rusty machine lumbered to the edge of the crater.

NPR: Excerpt: 'Legends'

They're readying black wooden fume boards--hive lids lined in absorbent black felt on which they will drizzle butyric acid, the active ingredient in rancid butter.

FORBES: Magazine Article