《ragweeds》是什么意思
英英释义
ragweed[ 'ræɡwi:d ]
- n.
- widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
同义词：ragworttansy ragwortbenweedSenecio jacobaea
- any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
同义词：ambrosiabitterweed
- widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
学习《ragweeds》怎么用
权威例句
Ragweeds (Ambrosia L.) in BritainRagweeds (Ambrosia spp.): The Hay Fever WeedsRAGWEEDS, AMBROSIA SPECIES, IN CANADA AND THEIR HISTORY IN POSTGLACIAL TIMEThe North American ragweeds and their occurrence in other parts of the world.THE MORPHOLOGY OF THE INFLORESCENCE OF RAGWEEDS (AMBROSIA〧RANSERIA : COMPOSITAE)Ecological characteristics of the ragweeds and countemeasure of the biological weed controlFLOWERING BEHAVIOR AND NATURAL DISTRIBUTION OF THE EASTERN RAGWEEDS (AMBROSIA) AS AFFECTED BY LENGTH OF DAYThe Phytophagous Insect Faunas of the Ragweeds, Ambrosia chenopodiifolia, A. eriocentra , and A. ilicifolia , in Southern California[Biological and clinical prevalence of pollinosis caused by ragweeds of the upper valley of the Rhone corridor]Pollen-wall proteins: Localization of antigenic and allergenic proteins in the pollen grain walls of Ambrosia spp. (ragweeds)