n.豚草属
ragweeds───n.豚草属
rag week───破烂周
ragwheel───碎布轮
agreed───adj.同意的；通过协议的；v.同意；赞成（agree的过去式）
fanweed───番草
hogweed───n.豕草，猪草；欧洲防风独活属植物
matweed───麦草
mayweed───狗茴香
oarweed───n.昆布
sediments using ragweed and nuclear fallout.───利用豚草及核放射物对沉积物进行年代推定。
Ragweed that seems to be knitted Out of yellow wool───豚草好像是由黄色的羊毛
Ragweed pioneers idle fields.───豚草常是闲置耕地的先锋植物。
It meant crossing a broad field of ragweed, breathing heavily as the two of us lugged the canoe, heavy with its layers of paint.───这意味着要越过宽阔的豚草区；我们两个小伙子气喘吁吁地拖着有很沉涂料层的独木舟。
Hakka mountain pig is the main lines of business, and the pigs using less feed, even to a child once played ragweed.───客家山区，是猪的主要业务，并使用更少的猪饲料，甚至曾经扮演过豚草一个孩子。
The two grubby small boys with two-coloured hair who were digging among the ragweed in front yard.───两个肮里肮脏的长着亚麻色头发的小男孩正在前院的杂草丛里挖什么东西。
The Common Agricultural Policy, which instituted the fallow system, initially contributed thereby to the increase of Ragweed.───共同农业政策，其中提起的休耕制度，初步作出了贡献，从而对豚草的增加。
Even if you live in an urban area, you can still be affected because ragweed grains can travel up to 400 miles.───猪草花粉可以飘到400英里的区域，所以即使你住在郊区，仍然难免受到期困扰。
It's enough to make you grab a tissue: Minneapolis has tacked 16 days to the ragweed pollen season since 1995; LaCrosse, Wisc.───下面的数据将使你忍不住抓起一张纸巾：明尼阿波利斯市自1995年以来的花粉季增加了16天；
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Whether the trigger is pollen or ragweed, suffering during allergy season is no fun.
For 75 percent of those 35 million, ragweed is the primary allergen, he added.
However, people who are allergic to ragweed or daisy pollen can have a similar allergic reaction to echinacea.
The ragweed, Ambrosia artemisiifolia L. , is one of the most hazardous weed species distributed worldwide and causing serious damages to agricultural production and human health.
The ragweed Ambrosia artemisiifolia, an alien invasive weed, can profoundly influence natural ecosystems, agriculture, and human health.
To suppress the spread of the ragweed, there have been a lot of studies on their chemical control, physical control, plant displacement and biological control.
Ragweed causes runny noses and watery eyes.
Methods Extract of artemisia pollen and ragweed pollen were prepared SDS-PAGE and Coomassis were used to analyze proteins.