black alder

• 赤杨

black alder的用法和样例：

例句

1. Alder trees belong to the birch family.
   赤杨属于桦木科。
2. The microorganisms involved in symbiosis with the alder tree are actinomycetes of the genus Frankia.
   而与赤杨共生的微生物是放线菌。