营养共生 syntrophism，cross－feeding （1）两种以上的微生物在同一培养基中共存时，因为能互相分泌出为另一微生物成长所必需的营养物质，因而对单独生存有困难的种类可由此而获得了生长。营养共生也可说是生长速度增大的一种现象。
... 营养个员 gastrozooid; 营养共生 trophobiosis; nutritive symbiosis; 营养过度 overnutrition; ...
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作为回报，人类宿主为其提供了温暖的生存环境且供给营养，这种共生关系已经维持了几百万年了。
In return, their human hosts provide them with a warm place to live and a share of their meals. It is a symbiotic relationship that has worked well for millions of years.
我们正在研究一种很少人知晓的共生互动关系，在这种关系中，细菌保护其宿主免受病原体侵害，而不是那种更为常见的为其提供营养方面。
We are studying one of the few known symbiotic interactions in which the bacterial partner defends its host against pathogens — rather than providing a nutritional benefit, which is more common.
根瘤菌通过形成根瘤和它们的宿主建立了一种共生关系——用氮换取营养。 根瘤通常会渗透进植物的根，有时候还会渗透进植物的茎。
Rhizobia establish a symbiotic relationship with their host plant ― exchanging nitrogen for nutrients ― by forming nodules, which penetrate the roots and sometimes stems of the plant.
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