比毒蛇牙齿更尖锐的是有一个忘恩负义的孩子。

How sharper than a serpent's tooth is to have a thankless child.

youdao

比毒蛇牙齿更尖锐的是有一个忘恩负义的孩子。

How sharper than a serpent's tooth is to have a thankless child.

youdao