n.（活）体外；试管内

The study was conducted in vitro using cell cultures.
这项研究在体外，利用细胞培养进行。
They tested the drug's efficacy in vitro before moving to animal trials.
他们在将药物移至动物试验前，在体外测试其功效。
The bacteria were grown in vitro for several days.
细菌在体外培养了几天。
The new cancer treatment showed promising results in vitro.
新的癌症疗法在体外显示出有前景的结果。
The enzyme's activity was measured in vitro under controlled conditions.
在控制条件下测量了该酶的体外活性。
The virus replicated well in the in vitro environment.
病毒在体外环境中复制良好。
Researchers compared the growth of two plant species in vitro.
研究人员比较了两种植物在体外的生长情况。
In vitro fertilization (IVF) is a common assisted reproductive technology.
体外受精（IVF）是一种常见的辅助生殖技术。
Scientists observed cellular reactions in vitro to understand the process better.
科学家观察体外的细胞反应以更好地理解这一过程。
The study on plant genetics often involves manipulating genes in vitro.
关于植物遗传学的研究经常涉及体外基因操作。