低收入人群的英文：
low-income population

参考例句：

In effect, growth is contingent on improved incomes for the mass of the low-income population.
事实上，发展有赖于大量低收入人群收入的增长。

low是什么意思：
adj. 低的；在底部的；不足的；低于通常标准的；沮丧的；差的；状态不佳的
adv. 向下；在靠近…底部的位置；低于通常的水平；低声地
n. 低水平；低谷；低气压区
v. （牛）哞哞叫

low-velocity drop
低速度空投

To speak with a low, hoarse voice.
低哑地说用低而嘶哑的声音说话

To rate too low;underestimate.
低估对…估价太低；低估

income是什么意思：
n. 收入；收益；所得

IQC Incoming quality control
来料检验

Incoming fire has the right of way.
飞来的子弹有优先通行权。（挡它的道你就要倒大楣！）

He has a comfortable income.
他有充裕的收入。

population是什么意思：
n. 人口；全体居民；动植物总数

The population is on the decline.
人口在减少。

The population is dwindling.
人口在逐渐减少。

Attach importance to the problem of population aging (an aging population )
重视老龄化问题