笨小孩（名词，俚语）

(noun, SLANG) A boring, clumsy, sloppily dressed young person, usually male, who lacks appropriate social skills.

EXAMPLE: Before college, my little brother was a shy and lonely dweep who girls ignored, but then he changed completely and now he's handsome, trendy, and very popular.

在上大学之前，我的弟弟是个腼腆、孤僻、女孩们看不上的笨小孩，但后来他发生了彻底的改变，现在他英俊、时髦，非常受人喜爱。

something doesn't grow on trees

不是从天上掉下来的（传统表达法）

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

EXAMPLE: 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。