The recent killing of three people with ties to the U.S.consulate in Juarez,Mexico, and the shooting death of a popular rancher on his property in Arizona, are increasing the anger over drug-related violence on both sides of the U.S.-Mexican border.

VOA: standard.2010.04.21

So, the take-home message is whether you have three photons or 3,000,000 photons that you're shooting at your metal, if you're not at that minimum frequency or that minimum energy that you need, nothing is going to happen.

所以，这里表明的信息是,无论是向金属发射3个光子,还是300万个光子,如果没有达到所需的最低频率,或者最小能量,什么事情都不会发生。

麻省理工公开课 - 化学原理课程节选

So, the take-home message is whether you have three photons or 3,000,000 photons that you're shooting at your metal, if you're not at that minimum frequency or that minimum energy that you need, nothing is going to happen.

所以，这里表明的信息是,无论是向金属发射3个光子,还是300万个光子,如果没有达到所需的最低频率,或者最小能量,什么事情都不会发生。

麻省理工公开课 - 化学原理课程节选