Zài nóngcūn, gěi lǎorén zhǔnbèi shòucái shì xiàoshùn de biǎoxiàn.
In the countryside, preparing a coffin for the elderly is seen as filial piety.
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寿 'longevity' here is a euphemism: 寿材, 寿衣 (burial clothes), and 寿木 all frame death with an auspicious word. Preparing one's own 寿材 was traditionally a sign of a long, settled life. Synonym 棺材 is the plain, neutral word.