common birch

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。

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common birch of the eastern united states having spicy brown bark yielding a volatile oil and hard dark wood used for furniture.

美国东部的一种普通桦树，树皮褐色，生产一种挥发油，木材坚硬，暗色，用于做家具。

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