South Africa has more than five million people infected with H.I.V., the largest number of any country.

VOA: special.2009.07.29

So if delta v is negative, in this case delta v is negative, OK, delta v is negative, pressure is a positive number, negative times negative is positive, work is greater than zero.

也就是当活塞,压缩气体的时候，做的功是正的，按照这一规定,我们需要在这里，加上一个负号，这是习惯规定。

麻省理工公开课 - 热力学与动力学课程节选

In this case, V = /P. Have two quantities and the number of moles gives you another property. You don't need to know the volume. All you need to know is the pressure and temperature and the number of moles to get the volume.

以及气体的摩尔数,就可以得到第三个量,知道压强，温度和气体的,摩尔数就可以推导出气体的体积,这称为状态方程,它建立了状态函数之间的联系。

麻省理工公开课 - 热力学与动力学课程节选

Samantha Barks also of Les Miz sported a black Valentino number with a deep-V plunge on the front.

FORBES: The Red Carpet At 2013 Oscars

Their final design of the QSST jet is reminiscent of Concorde in its delta wing shape, but with a number of unique features, including an "inverted V-tail" and tailored nose cone.

CNN: Bang goes the sonic boom

Since coming to office, moreover, the Clinton administration has enunciated a number of policies that have only strengthened the case for the V-22.

CENTERFORSECURITYPOLICY: Peace dividend on wings of the Osprey