symmetrical [balanced] input,對稱[平衡]輸入

symmetrical [balanced] output,對稱[平衡]輸出

symmetrical double yoke permeameter [magnetic bridge],對稱雙軛磁導計

synchro detector,同步檢測器

synchronoscope,同步指示器

synchronous transmission,同步傳輸

syphon,彎管

system,系統

system aggregation,系統集結

system analysis,系統分析

system approach,系統方法

system architecture,体系結构

system assessment,系統評估

system crate,系統机箱

system decomposition,系統分解

system deviation,系統偏差

system diagnosis,系統診斷

systems engineering,系統工程

system environment,系統環境

system evaluation,系統評定；系統評价

system homomrphism,系統同態

system identification,系統辨別

system interrupt,系統中斷

system isomorphism,系統同构

system maintainability,系統可維護性

system management,系統管理

system matrix,系統矩陣

system model,系統模型

system modeling,系統建模；系統模型化

system of units (of measurement),（測量）單位制

system optimization,系統（最）优化

system parameter,系統參數

system performance test,系統性能試驗

syste planning,系統規划

system production time,系統生產時間

system reliability,系統可靠性

system resourse,系統資源

system sensitivity,系統靈敏度

system simulation,系統仿真

system software,系統軟件

system state,系統狀態

system statistical analysis,系統統計分析

system test time,系統測試時間

system theory,系統理論

systematic error,系統誤差

systematic uncertainty,系統不确定度

systematology,系統學

tachometer,轉速表

tachometer generator,測速發電机

tacho-torquemeter,轉矩轉速測量儀

tailing peak,拖尾峰

tailored control system,柔性控制系統

take-off angle,出射角

take-up,縮格

tandem data circuit,級聯數据電路

tape recorder of digital logging,數字測井磁帶記錄儀

taperecorder,磁帶記錄儀

tapping,取壓口；輕敲

target,靶；覘標

target computer,目標計算机

target flow transducer,靶式流量傳感器

target flowmeter,靶式流量計

target size,目標尺寸

taring construct,去皿裝置

task,任務

task allocation,任務分配

task coordination,任務協調

task cycle,作業周期

task level language,作業級語言

task optimization,任務优化

task program,作業程序

taut supension galvanometer,張絲式檢流計

technical evaluation,技術評定；技術評价

technical regulation,技術法規

technical specification,技術規范

techniques for approximating the ITS-90,ITS-90的近似技術

telecommunication,遠程通信

telemeasuring equipment,遙測裝置

telemechanics,運動學

telemetering and remote control system,遙測遙控系統

telemetering communication system,遙測通信系統

telemetering instrument,遙測儀器儀表

telemetering STD profiling system,遙測溫鹽深剖面儀

telemetering system of frequency division type,頻分（制）遙測系統

telemetering system of time division type,時分（制）遙測系統

telemetering wave buoy,遙測波浪浮標

telemetry,遙測

telemetry strain indicator,遙測應變儀

telemetry system,遙測系統

teleological system,目的系統

teleology,目的論

teleophotometer,遙測光度表

teleprinter,電傳打字机

teleprocessing,遠程處理

telepsychrometer,遙測濕度儀

telescope,望遠鏡

telescope level,望遠鏡水准器

telescopic system,望遠鏡系統