| 释义 |
ragweed pollen ˈræɡwi:dˈpɔlən 短语¹⁴⁴⁹⁷²⁺²
基本英英例句
豚草花粉
Noun:
pollen of the ragweed plant is a common allergen A paper published in the Proceedings of the National Academy of Sciences reported that the ragweed pollen season in North America has been getting longer as the number of frost-free days increases.
一篇发表在国家科学院行动计划里的论文中说：花粉过敏症季节已经跟北美无霜期一样延长了。 yeeyan
In one study, accelerating spring's arrival by30 days prompted a 54 percent increase in ragweed pollen production.
在一个研究中表明，春天加速30天到来提高了花粉54%的产量。 yeeyan |