in vitro
adjective [ before noun ], adverb uk/ˌɪn ˈviː.trəʊ/ us/ˌɪn ˈviː.troʊ/
（生物过程或生物反应）在体外（常指试管内）进行的
happening outside the body in artificial conditions, often in a test tube
Scientists are studying these cells in vitro. 科学家们把这些细胞放在试管里进行研究。
in vitro experiments 在试管中进行的实验