火星上存在生命的唯一可信依据将会是我们实验室里有从返回任务带回的样本中提取的微生物。

The only convincing evidence for life on Mars will be when we have a microbe in the lab from a sample return mission.

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For those of you don't know what that is it's simply an instrument that counts radioactive particles in the air, and MIT now that you're at MIT, you'll all have a chance to see one first hand if you're ever in any of the labs, especially in the chemistry or bio labs.

不知道它是什么,它就是一个简单的,计算在空气中放射粒子数目的仪器,你们现在来了，如果你们在实验室里工作的话,尤其是化学和生物实验室，你们有很多机会亲手用到它。

麻省理工公开课 - 化学原理课程节选