Much easier to keep a flask of cells under very sterile, very reproducible conditions than it is to keep a small animal, right?

保存一小瓶细胞,该细胞可在无菌条件下再生,这要比保存小动物容易的多

耶鲁公开课 - 生物医学工程探索课程节选

and I think a lot of people might think that it's a very sterile subject,

许多人也许认为文学枯燥无味，

文学是灵魂的方式 - SpeakingMax英语口语达人