美国榆;
In Beijing, for example, the most common allergenic pollens in spring include those from the large-fruited elm tree, Cathay poplar, ash, acacia and white birch.
以北京为例,春季最常见的致敏花粉包括榆树、杨树、白蜡、合欢树和白桦的花粉。
Experiments of intercropping crops and forest trees carried out in artificial white elm forest show that different intercorpping types and numbers of years have obvious effects on the growing of wind-breaking and dune-fixing forests;
在白榆人工林内进行的农林间作试验表明:不同的间作类型和不同的间作年限,均对防风固沙林的生长有显著影响;
微语录 · 生活常识
微语录 · 句子大全
微语录 · 爱情句子
微语录 · 个性签名