stay afloat 能维持下去
They will have to makeat least 20,000 yuan per month, just to stay afloat.
他们至少要月入2万，才能维持下去。
How do you think they'restaying afloat?
你觉得他们是怎么维持（资金）周转的？

cover one's expenses 收支平衡
The payments he gets barely cover his expenses.
他几乎是入不敷出。

on easy street 生活优裕；安定富足
If I get this new job, we'll be living on easy street.
如果我得到这份新工作，我们就能有钱了。

be rolling in money/it 非常富有，财源滚滚
This man wasa tycoon as well as a doctor; he must be rolling in money.
这个人是个商业大佬，还是一个医生，他肯定非常有钱。

well-heeled 有钱的，富有的；有钱人
His family was very well-heeled.
他的家庭非常富有。

well-to-do 有钱的，富有的
They're very well-to-do.
他们很阔绰。

one percenters 极有钱的人