The problem looks simple, but when you try to unlash it you'll find it's a real teaser.

这个问题看起来简单，但是你要“解开”它时你就会发现它还真是一道难题。

youdao

The problem looks simple, but when you try to unlash it you'll find it's a real teaser.

这个问题看起来简单，但是你要“解开”它时你就会发现它还真是一道难题。

youdao