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py·re·thrum 英paɪˈriːθrəm, -ˈreθrəm美paɪˈriθrəm, -ˈrɛθrəmAHDpī-rēʹthrəm, -rĕthʹrəm COCA¹⁸⁷⁹⁸³BNC¹¹⁴⁰²⁴⁺⁵iWeb⁴⁸³⁶⁸
基本英英词源搭配近义反义例句例句
n.除虫菊¹⁰⁰复数pyrethrums
Noun:
made of dried flower heads of pyrethrum plantswhite-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemumspring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemumused in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum来自拉丁语pyrethrum,来自希腊语purethron,野甘菊，小白菊。pyrethrum extract除虫菊萃pyrethrum powder除虫菊粉pyrethrum flowers化 除虫菊花…
近义词 Chrysanthemum coccineum医 红花除虫菊…
名词100%
用作名词This article draws up thepyrethrumester insecticide.本品是拟除虫菊酯类杀虫剂。 The pyrethrins are mainly synthesized in pyrethrum flowers and the content is more than 95%. The content in the dried flowers is about 1.2-2.0%.
除虫菊素主要在除虫菊花中合成，其含量占整个植株的95%以上，而干花中除虫菊素含量在1.2-2.0%。 fabiao
Extracted pyrethrins from pyrethrum dried flower by super critical CO2.
采用超临界 CO2萃取除虫菊中有效成分除虫菊酯。 dictall.com
Extracted pyrethrins from pyrethrum dried flower by super critical CO2. is a paste called oleoresin which isn't suitable to formulate insecticidal products either use in household or crops.
用超临界 CO2从除虫菊干花中萃取的除虫菊素，这种膏状物不能直接用来加工或深加工杀虫产品。 chemyq
Improving the content of pyrethrins in pyrethrum through genetic engineering technology is restricted, for little is known about pyrethrins- related genes.
但国内外对于天然除虫菊素合成相关基因的研究很少，从而制约了利用基因工程技术提高除虫菊花中除虫菊素的含量。 fabiao
Other crops have Joan hemp, corn maize, all kinds of beans, banana, cinnamomum bark, cotton, pyrethrum and potatoes.
其他作物有琼麻、玉米玉蜀黍、各种豆类、香蕉、金合欢树皮、棉花、除虫菊和马铃薯。 xkyn.net
This article draws up the pyrethrum ester insecticide.
本品是拟除虫菊酯类杀虫剂。 webshop.zgny.com.cn
To evaluate the immune toxicity of natural pyrethrum.
目的检测天然除虫菊酯的免疫毒性。 cnki
Pyrethrum impregnated bed nets were effective for control of malaria and it is an important measure for management of floating population.
用除虫菊酯浸泡蚊帐防治疟疾及传疟媒介获得良好效果，可作处理流动人口疟疾疫点的重要措施。 cnki
Pyrethrum possesses some ideal characteristics of environmental compatible chemical pesticide, however its photo lability and expensive price limit its broad use in the field.
天然除虫菊酯虽然具有理想化学农药的一些特性，但光不稳定性和昂贵的价格限制其大面积使用。 cnki |