"It's physiological and it's emotional." "Physiologically,we have a tendency when we come into a situation that seems dangerous we get a lot of chemicals flowing through our bodies to help us stay alert, to be able to act if we need to act.

VOA: standard.2010.07.01

So, this is really a pretty dangerous situation that's always interesting to point out.

所以我总要指出,这是个很危险的事情。

麻省理工公开课 - 化学原理课程节选

So, this is really a pretty dangerous situation that's always interesting to point out.

所以我总要指出,这是个很危险的事情。

麻省理工公开课 - 化学原理课程节选