n.
a deep prolonged loud noise
同义词：roarroaringthunder
a state of economic prosperity
a sudden happening that brings good fortune (as a sudden opportunity to make money)
"the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line"
同义词：bonanzagold rushgravygodsendmanna from heavenwindfallbunce
a pole carrying an overhead microphone projected over a film or tv set
同义词：microphone boom
any of various more-or-less horizontal spars or poles used to extend the foot of a sail or for handling cargo or in mooring
