| 单词 | ragweed pollen |
| 释义 | ragweed pollen (once / 1181932 pages) n WORD FAMILY ragweed pollen USAGE EXAMPLESIn the late summer and early fall, during ragweed pollen season, pollen levels are highest in the morning. US News(Jun 15, 2016) It's projected that ragweed pollen levels are likely to quadruple for much of Europe. US News(May 25, 2015) The report is one of the first to identify the areas that have both high ozone levels and ragweed pollen. Scientific American(May 13, 2015) n pollen of the ragweed plant is a common allergen Hyper pollen the fine spores that contain male gametes and that are borne by an anther in a flowering plant allergenany substance that can cause an allergy |
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