| 系主任 | xì zhǔ rèn | chairman of department; dean; CL:位,个 |
| 系列放大器 | xì liè fàng dà qì | series amplifier |
| 系列片 | xì liè piān | film series |
| 系统性 | xì tǒng xìng | systematic |
| 经典动力系统 | jīng diǎn dòng lì xì tǒng | classical dynamical system (physics) |
| 经济体系 | jīng jì tǐ xì | economic system |
| 网管系统 | wǎng guǎn xì tǒng | network management |
| 网络操作系统 | wǎng luò cāo zuò xì tǒng | network operating system |
| 网络管理系统 | wǎng luò guǎn lǐ xì tǒng | network management system; NMS |
| 网路作业系统 | wǎng lù zuò yè xì tǒng | network operating system |
| 线性系统 | xiàn xìng xì tǒng | linear system |
| 编码系统 | biān mǎ xì tǒng | coding system |
| 系上 | jì shang | to tie on; to buckle up; to fasten |
| 系囚 | jì qiú | to be imprisoned |
| 系囚 | xì qiú | prisoner |
| 系泊 | jì bó | to moor |
| 置信系数 | zhì xìn xì shù | confidence coefficient (math.) |
| 联系方式 | lián xì fāng shì | contact details; methods of contacting (used on letterhead or website) |
| 声类系统 | shēng lèi xì tǒng | phonetic system |
| 自主系统 | zì zhǔ xì tǒng | autonomous system |
| 血缘关系 | xuè yuán guān xì | blood relation; consanguinity |
| 卫星定位系统 | wèi xīng dìng wèi xì tǒng | global positioning system (GPS) |
| 卫星导航系统 | wèi xīng dǎo háng xì tǒng | satellite navigation system; sat-nav |
| 复杂系统 | fù zá xì tǒng | complex system |
| 褶皱山系 | zhě zhòu shān xì | fold mountain system (geology) |
| 褶皱山系火地岛 | zhě zhòu shān xì huǒ dì dǎo | Tierra del Fuego, Patagonia |
| 视空间系统 | shì kōng jiān xì tǒng | visuo-spatial sketchpad |
| 亲缘关系 | qīn yuán guān xì | family relation |
| 解铃系铃 | jiě líng xì líng | lit. whoever hung the bell on the tiger's neck must untie it (idiom); fig. whoever started the trouble should end it |
| 讯息处理系统 | xùn xī chǔ lǐ xì tǒng | Message Handling System; MHS |
| 语系 | yǔ xì | language system |
| 谱系 | pǔ xì | pedigree |
| 宾语关系从句 | bīn yǔ guān xì cóng jù | object relative clause |
| 软件系统 | ruǎn jiàn xì tǒng | software system |
| 输入系统 | shū rù xì tǒng | input system; data entry system |
| 转关系 | zhuǎn guān xi | to transfer (from one unit to another) |
| 通讯系统 | tōng xùn xì tǒng | communication system |
| 连系 | lián xì | to link; to connect |
| 连系词 | lián xì cí | copula (linguistics) |
| 周期系 | zhōu qī xì | periodic system; cf periodic table of the elements 元素周期表 |
| 递推关系 | dì tuī guān xì | recurrence relation |
| 医学系 | yī xué xì | medical school |
| 金融系统 | jīn róng xì tǒng | financial system |
| 销售时点情报系统 | xiāo shòu shí diǎn qíng bào xì tǒng | point of sale system |
| 锕系元素 | ā xì yuán sù | actinoids (rare earth series), namely: actinium Ac89 锕, thorium Th90 钍, protoactinium Pa91 镤, uranium U92 铀, neptunium Ne93 镎, plutonium Pu94 钚, americium Am95 镅, curium Cm96 锔, berkelium Bk97 锫, californium Cf98 锎, einsteinium Es99 锿, fermium Fm100 镄, mendelevium Md101 钔, nobelium No102 锘, lawrencium Lr103 铹 |
| 镧系元素 | lán xì yuán sù | lanthanoid (rare earth series), namely: lanthanum La57 镧, cerium Ce58 铈, praseodymium Pr59 镨, neodymium Nd60 钕[nü3], promethium Pm61 钷, samarium Sm62 钐, europium Eu63 铕, gadolinium Gd64 钆, terbium Tb65 铽, dysprosium Dy66 镝, holmium Ho67 钬, erbium Er68 铒, thulium Tm69 铥, ytterbium Yb70 镱, lutetium Lu71 镏 |
| 闪含语系 | shǎn hán yǔ xì | Hamito-Semitic system of languages (incl. Arabic, Aramaic, Hebrew etc) |
| 开放式系统 | kāi fàng shì xì tǒng | open system(s) |
| 开放系统 | kāi fàng xì tǒng | open system |
| 开放系统互连 | kāi fàng xì tǒng hù lián | open systems interconnection; OSI |
