They keep their young at home until they are physically able to surviveon their own.
它们把幼崽留在家中，直到它们身体足够健壮，能够独立生存。
2
In many parts of the country a family of five might struggle to surviveon as little as $80 a month.
在这个国家的许多地方，一个五口之家靠每月80美元的资金很难维持生活。
3
The data will certainly fuel the ongoing debate over whether physical education classes should be cut as schools struggle to surviveon smaller budgets.