subsistence
n. 勉强生存，维持生计；赖以活命的食物（或钱）；<法律>有效
adj. 自给自足的，仅够自用的
例句
In this cupboard the grandfather kept everything that he needed for his subsistence.
爷爷把生活所需的一切东西都放在这个橱柜里。
They had no visible means of subsistence.
他们生计无着。
《牛津词典》
Many families are living below the level of subsistence.
许多家庭难以度日。
