rhizobium formation的用法和样例：
例句
- Nodules are not found on all species of legumes, nor are all species of Rhizobium capable of making nodules on leguminous plants.
不是所有的豆类植物中都能找到根瘤，也不是所有的根瘤菌都能在豆类植物中形成根瘤。 - The symbioses between Rhizobium and legumes and between Frankia and certain tree species reduce atmospheric N2 to forms available to the plant.
根瘤菌与豆科植物，弗兰克氏菌与某些树种形成的共生关系可以把空气中氮气还原成对植物有效形态。
