There are still some active smallpox virus specimens kept in the world, and there are two sources of small--two places where smallpox is stored now.

世界上仍有地方保存着,一些具有活性的天花病毒样本,有两个地方还储存着天花病毒样本

耶鲁公开课 - 生物医学工程探索课程节选

It's never perfect and we can't figure out yet a way to make it perfect and we still have small investors who are defrauded, who are treated badly.

事无完美,至今还没有完美的办法,仍然有许多小投资者,遭受欺诈,成为受害者

耶鲁公开课 - 金融市场课程节选

It's still undetectably small.

它仍然是无法察觉的小。

麻省理工公开课 - 化学原理课程节选

Or, if you're a pediatrician with a really small patient who will not sit still, it's because the laws of quantum mechanics don't allow an object to have a definite position and momentum.

或者你是个儿科医生,而你的小病人却总也坐不住,这是因为量子力学,不允许物体同时具有确定的位置和动量

耶鲁公开课 - 基础物理课程节选

And the challenge is to combine "the permission to be human" to experience the emotion to go through the motion and yet not to enter the downward spiral where six months later, after small incident, I'm still in that rot.

困难在于将之与准许为人相结合“,去体会情绪，实现转移,但不会进入下行螺旋，在发生小小意外六个月后，仍心情低落。

哈佛公开课 - 幸福课课程节选