A trap is only a trap if you don't know about it. If you know about it, it's a challenge.

A trap is only a trap if you don't know about it. If you know about it, it's a challenge.

陷阱只是你不知道的陷阱。如果你知道，这是一个挑战。

-- China Miéville 柴纳·米耶维