commensalism
noun [ U ] biology specialized uk/kəˈmen.səl.ɪ.zəm/ us/kəˈmen.səl.ɪ.zəm/
共生（共栖）（两物种之间的共生关系，在此关系中一个受益而另一个不受影响）
a relationship between two species in which one gets an advantage from living closely with the other and the other is not affected by it