Social security premiums have increased in the last 20 years, putting families on the threshold of poverty.

VOA: standard.2010.02.25

So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是,光从金属表面逐出一个电子,所需的最小频率。

麻省理工公开课 - 化学原理课程节选

So, in her first minute of San Narciso, a revelation also trembled just past the threshold of her understanding.

所以当她第一次，见到San，Narciso时，她获得了超过理解力范围的，震撼的启示。

耶鲁公开课 - 1945年后的美国小说课程节选

The incumbent is currently above the 50 percent threshold needed to avoid a runoff election.

VOA: standard.2009.09.15

So, now we can talk about it in different terms, Ei for example, talking about e sub i, which is the incident energy or the energy of the light that comes in, or talking about work function here, and that's just another way to say threshold energy.

现在我们可以从不同的方面,来谈论它了，举例来说，它是入射能量或者进来的光的能量,或者谈论这里的功函数，它是另一种描述临界能量的方式。

麻省理工公开课 - 化学原理课程节选

The threshold for weapons is 90 percent enrichment."

VOA: standard.2009.10.19

Clinton's comments came after United Nations-backed fraud investigators invalidated results from more than 200 polling stations in Afghanistan's August 20th election, which meant that incumbent President Karzai had dropped below the 50 percent vote threshold needed to avoid a run-off.

VOA: standard.2009.10.19