bǎo wán
bǎo quán sǔn Preservation of non-destructive  bǎo quán sǔn。《 sān guó zhì · wèi zhì · chuán》: jīn quán tuō zhū ruò jiáo quán bàojuān nüè zhèngmín miǎn liètōu 'ān xīn huì suī néng zhōng bǎo wányóu yán tǐng mìng shēn jiāng zhī wài