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

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

VOA: standard.2009.09.15

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