4. The first year's weeds on the Michigan plot are annual flowering plants , followed by tougher perennials like crabgrass and ragweed . Woodier shrubs will shade and suppress the flowers , followed by pines , which suppress the shrubs .
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在他们背后，公园的中心，是一个圆形喷泉，顶部竖立着一座青春女神赫珀的铜像，众神中的载杯者，为奥林匹斯众神提供花蜜和豚草。
Behind them, at the center of the park, was a circular fountain atopwhich stood a bronze statue of Hebe, the cup bearer of the gods, who plied theOlympians with nectar and ambrosia.
这些发现是基于去年国家野生动物联合会豚草的生长速度和花粉数量随着全球变暖增加的分析得出的。
The findings correlate with analysis last year by the National Wildlife Federation that found ragweed growth rates and pollen counts increased with global warming.
到6至7岁时，这835名儿童中，过半的人都有各种各样的过敏症，对常见的过敏原如尘螨，豚草和猫等产生过敏。
At six to seven years old more than half of the children were evaluated for their sensitivity to common allergens such as dust mites, ragweed and cats.
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