| 双凸面 | shuāng tū miàn | convex on both sides (of lens); biconvex |
| 双刃 | shuāng rèn | double-edged blade |
| 双十节 | shuāng shí jié | Double Tenth, the anniversary of the Wuchang uprising 武昌起义 of 10th October 1911; Taiwanese national holiday with a patriotic and militarist flavor |
| 双名法 | shuāng míng fǎ | binomial nomenclature (taxonomy) |
| 双后前兵开局 | shuāng hòu qián bīng kāi jú | Double Queen Pawn Opening; Closed Game (chess); same as 封闭性开局 |
| 双向 | shuāng xiàng | bidirectional; two-way; interactive |
| 双唇音 | shuāng chún yīn | bilabial consonant (b, p, or m) |
| 双唑泰栓 | shuāng zuò tài shuān | metronidazole, clotrimazole and chlorhexidine acetate (as suppository) |
| 双喜临门 | shuāng xǐ lín mén | two simultaneous happy events in the family |
| 双城 | Shuāng chéng | Suangcheng county level city in Harbin 哈尔滨, Heilongjiang |
| 双城子 | Shuāng chéng zi | Shuangchengzi, former name of Ussuriisk city in Russian Pacific Primorsky region |
| 双城市 | Shuāng chéng shì | Suangcheng county level city in Harbin 哈尔滨, Heilongjiang |
| 双塔 | Shuāng tǎ | Shuangta district of Chaoyang city 朝阳市, Liaoning |
| 双塔区 | Shuāng tǎ qū | Shuangta district of Chaoyang city 朝阳市, Liaoning |
| 双套 | shuāng tào | double set; diploid |
| 双子 | Shuāng zǐ | Gemini (star sign) |
| 双子座 | Shuāng zǐ zuò | Gemini (constellation and sign of the zodiac) |
| 双子叶 | shuāng zǐ yè | dicotyledon (plant family distinguished by two embryonic leaves, includes daisies, broadleaved trees, herbaceous plants) |
| 双学位 | shuāng xué wèi | dual degree (academic) |
| 双射 | shuāng shè | bijection; one-to-one map (math.) |
| 双层公共汽车 | shuāng céng gōng gòng qì chē | double decker bus |
| 双层巴士 | shuāng céng bā shì | double-decker bus |
| 双层玻璃 | shuāng céng bō li | double glazing |
| 双峰 | Shuāng fēng | Twin peaks; Shuangfeng county in Loudi 娄底, Hunan |
| 双峰县 | Shuāng fēng xiàn | Twin peaks county; Shuangfeng county in Loudi 娄底, Hunan |
| 双复磷 | shuāng fù lín | obidoxime chloride; toxogonin |
| 双性恋 | shuāng xìng liàn | bisexual; bisexuality |
| 双抽 | shuāng chōu | black soy sauce |
| 双拐 | shuāng guǎi | crutches |
| 双拼 | shuāng pīn | double pinyin |
| 双击 | shuāng jī | double-click |
| 双摆 | shuāng bǎi | double pendulum (math.) |
| 双方同意 | shuāng fāng tóng yì | bilateral agreement |
| 双曲 | shuāng qū | hyperbola; hyperbolic (function) |
| 双曲抛物面 | shuāng qū pāo wù miàn | hyperbolic paraboloid (math.) |
| 双曲拱桥 | shuāng qū gǒng qiáo | double arched bridge |
| 双曲正弦 | shuāng qū zhèng xián | hyperbolic sine or sinh (math) |
| 双曲线正弦 | shuāng qū xiàn zhèng xián | hyperbolic sine or sinh (math) |
| 双曲余割 | shuāng qū yú gē | hyperbolic cosecant, i.e. function cosech(x) |
| 双曲余弦 | shuāng qū yú xián | hyperbolic cosine or cosh (math) |
| 双月刊 | shuāng yuè kān | bimonthly publication |
| 双柏 | Shuāng bǎi | Shuangbai county in Chuxiong Yi autonomous prefecture 楚雄彝族自治州, Yunnan |
| 双柏县 | Shuāng bǎi xiàn | Shuangbai county in Chuxiong Yi autonomous prefecture 楚雄彝族自治州, Yunnan |
| 双核 | shuāng hé | dual core (computing) |
| 双极 | shuāng jí | bipolar |
| 双杠 | shuāng gàng | parallel bars (gymnastics event) |
| 双桥 | Shuāng qiáo | Shuangqia suburban district of Chongqing municipality, formerly in Sichuan |
| 双桥区 | Shuāng qiáo qū | Shuangqia suburban district of Chongqing municipality, formerly in Sichuan; Shuangqia district of Chengde city 承德市, Hebei |
| 双壳类 | shuāng ké lèi | bivalve; Lamellibranchia |
| 双氯灭痛 | shuāng lǜ miè tòng | diclofenac pain-killer; also called 扶他林 |
