Many already subsist on the mere threshold of survival.

许多人早已是仅仅能够维持生存。

youdao

Dinosaurs were most likely wiped out by a giant meteor that cooled Earth's temperatures below their threshold for survival.

恐龙的灭绝很可能是由于一颗巨大的流星导致地球温度降到了它们生存的临界值以下。

youdao

This group of people has passed the threshold of survival and does not need to worry about the basics such as food and clothing, and it has some disposable income to buy discretionary goods and services.

FORBES: Defining the Chinese Middle Class