The other side of the coin 就是指一件事情的另一面或相反的观点。

例句

I always thought teachers were really unfair to pupils, but I saw the other side of the coin when I became one myself.

Many people think social networking sites are great fun, but the other side of the coin is that people are spending too much time on the internet.

请注意

短语 two sides to the same coin 一枚硬币有两面，这个短语的意思指两件事物在某种程度上有所关联。

Unemployment and rising crime are two sides to the same coin.