单词	thresher
释义	thresher /ˈθrɛʃə / noun 1A person or machine that separates grain from corn or other crops by beating.Agriculture thrives on the other side of those hills; grain threshers reaping wheat, trucks full of tomatoes, cucumbers and watermelons.... Drilling rigs replaced grain threshers and steam tractors at a frenzied pace. Magnus described respiratory symptoms among threshers of grain in 1555. 2 (also thresher shark) A surface-living shark with a long upper lobe to the tail. Threshers often hunt in pairs, lashing the water with their tails to herd fish into a tightly packed shoal. Alopias vulpinus, family Alopidae. ‘In September a thresher shark was spotted near Turbot Bank, off Freshwater West,’ said Mark Burton, assistant marine conservation officer at Skomer Marine Nature Reserve.... At 28m to the west of the channel mouth is an interesting pinnacle which acts as a magnet for schooling fish and their predators, including the infamous ‘grim reaper’ - the thresher shark. Peering through my viewfinder, I could scarcely believe what I was seeing, because the pelagic thresher shark is extremely rare. Rhymes flesher, fresher, pressure
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