That is, the amount of debris... Currently in orbit has reached a threshold where it will continually collide with itself, further increasing the population of orbital debris.

这就是说，现在在轨道上的残骸的数量已经到达了一个数值，然后它们就会慢慢开始自己相互碰撞，这样就会产生新的碎片。

youdao

Some bioluminescent bacteria, for example, light up when their population exceeds a threshold size (Journal of Bacteriology, vol 104, p 313).

例如有些生物发光菌当他们的数量超过某个界限值就会发光。

youdao

Most studies could not quantify disease frequency in the general population as they are hospital-based and confounded by variations in threshold and the rate of hospitalization.

多数研究不能把一般人群当中的发病频率给予定量是因为它们是基于医院的并且被混杂在住院率的变化之中。

youdao

In future communications the committee may adjust upwards its Personal Income threshold to account for population growth and other fundamental factors.

FORBES: Is Quantitative Easing Necessary?

But dams, diversions and recent drought have combined to push the spawning salmon population in the Klamath well below the 35, 000-fish threshold deemed necessary for the river to maintain a sustainable salmon population.

ECONOMIST: Saving the fish of the Klamath river

The threshold for being liable for this levy should be set high enough to exclude most of the working population.

FORBES: Fact and Comment