| Trad. | Simp. | Pinyin | English |
| 半衰期 | bàn shuāi qī | half-life | |
| 衰 | cuī | mourning garments | |
| 衰變 | 衰变 | cuī biàn | radioactive decay |
| 放射性衰變 | 放射性衰变 | fàng shè xìng shuāi biàn | radioactive decay |
| 光纖衰減 | 光纤衰减 | guāng xiān shuāi jiǎn | optical attenuation |
| 經濟衰退 | 经济衰退 | jīng jì shuāi tuì | (economic) recession |
| 衰 | shuāi | weak; feeble; decline; wane | |
| 衰敗 | 衰败 | shuāi bài | decay |
| 衰變鏈 | 衰变链 | shuāi biàn liàn | decay chain |
| 衰變曲線 | 衰变曲线 | shuāi biàn qǔ xiàn | decay curves |
| 衰變熱 | 衰变热 | shuāi biàn rè | decay heat |
| 衰減 | 衰减 | shuāi jiǎn | to weaken; to attenuate |
| 衰老 | shuāi lǎo | (adj) feeble and old | |
| 衰落 | shuāi luò | decompose | |
| 衰弱 | shuāi ruò | weak; feeble | |
| 衰退 | shuāi tuì | decline; fall; drop; falter | |
| 衰微 | shuāi wēi | be in decline; decline; wane; be weakened | |
| 衰運 | 衰运 | shuāi yùn | decline in fortunes |
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