中药天麻是一种退化的兰科植物，生长于山区，依靠兼性寄生于栎属树种上的蜜环菌为生。
The traditional medicine gastrodia is a degenerated orchid plant which grows depending on the Armillaria symbiosis on Quercus species in wild mountain area.
兼性寄生的能在不同环境条件下活动的。用于某些生物，如细菌在有氧或无氧条件下都能生存。
Capable of functioning under varying environmental conditions. Used of certain organisms, such as bacteria that can live with or without oxygen.
目的布鲁氏菌是兼性细胞内寄生菌，能够在吞噬细胞内长期存活并繁殖，引起家畜流产和人的波浪热。
Brucella SPP are the facultative intracellular pathogens with the ability to survive and multiply in phagocytes, and they can cause abortion of pregnant domestic animals and undulant fever in humans.
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