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said to warn someone to be careful how much money they spend, because there is only a limited amount
(提醒别人花钱时要谨慎)钱可不是从树上长出来的，钱可不是从天上掉下来的
"Mum, I'd like a new bike."
“妈妈，我想要辆新自行车。
"I'll have to think about it - money doesn't grow on trees, you know!" ”
“我得想想看──你知道，钱可不是从天上掉下来的!”