asymbiotic nitrogen fixer

例句：

1. 1. Thisplant is a key player in the nitrogencycle, helping to fix nitrogen from theatmosphere.
   这种植物是氮循环的关键参与者，帮助从大气中固定氮。
2. 2. The bacteriathat live on the roots of this plantare known as asymbiotic nitrogen fixers.
   生活在这种植物根部的细菌被称为共生固氮者。
3. 3. In agriculture, these organisms play a crucial role in fixing atmospheric nitrogen and improving soilfertility.
   在农业中，这些生物在固定大气中的氮并提高土壤肥力方面起着至关重要的作用。