something doesn't grow on trees 不是从天上掉下来的（传统表达法）

英文释义

Traditional expression referring to something (usually money) that is not easy to acquire, but that requires hard work, and so deserves respect.

例句

When I was young, I was lazy, but then I realized that money doesn't grow on trees, and if I wanted to be rich I needed to work hard.

我年轻时很懒，但后来我知道，钱不是从天上掉下来的。要想发财，就得努力工作。