在神话故事中，邪恶的巫师经常用巨蛇来守护他的宝藏。

In myths, the evil wizard often used giant ___serpents to guard his treasures.

她表面温柔，实则是条毒蛇，暗中破坏我们的友谊。

She appeared kind, but was actually a ___serpent undermining our friendship.