Voters in Washington State approved a system like this in two thousand four.

VOA: special.2010.06.12

The total energy of the system, which we are going to get from postulate number four, which says the energy of the electron, which is the energy of the system, is the sum of the kinetic and the potential energy.

这个系统的总能量，也就是我们将从第四个假设中算出的能量，也就是电子运动产生的能量，也就是整个系统的能量，是动能和位能的总和。

麻省理工公开课 - 固态化学导论课程节选

So, conclusion, four, we are not a purely physical system.

结论,四,我们不只是纯粹的物理系统

耶鲁公开课 - 死亡课程节选

Damascus has steadfastly denied the charges. Hilal Kashan, professor of political science at the American University of Beirut, thinks that the Hezbollah-led opposition scored a big victory with the general's release and could win the parliamentary elections because of it:"The opposition is using the release of the 4 senior officers as a moral victory, and says for the past 3 years and 8 months, four officers were jailed for no reason, whatsoever and they are coming hard on the Lebanese legal system and the process the Lebanese government, and they say this is the beginning,"

VOA: standard.2009.04.30