| Source | Target | | 临界点 | break-even point, transition point |
| 主传动轴 | gearbox main shaft, main gear shaft, transmission main shaft |
| 主动准双曲线伞齿轮 | hypoid drive |
| 主动凸轮 | actuating cam, operating cam |
| 主动悬挂系统 | active suspension, automatic suspension, electric suspension control system, electronic suspension control |
| 主喷嘴 | main jet, power jet |
| 主弹簧片 | main spring leaf, master spring leaf |
| 主消音器 | main muffler, main silencer |
| 主皮碗 | primary cup |
| 主继电器 | main relay, power-cut relay |
| 主要的 | leading |
| 主轴 | spindle |
| 主轴承 | base bearing, crankshaft main bearing, main bearing |
| 主轴承盖 | main-bearing cap |
| 主轴瓦 | main-bearing shell |
| 主轴臂 | spindle arm, steering arm |
| 主轴齿轮 | primary-shaft gear |
| 主销 | king pin, steering-knuckle pin, steering-stub bolt, steering-swivel bolt, swivel king pin, swivel pin |
| 主销倾角 | king-pin angle, king-pin inclination |
| 主销后倾角 | caster angle, castor angle |
| 主销轴承 | king-pin bearing |
| 乘客 | passenger |
| 乘客舱 | passenger compartment |
| 乙二醇 | ethylene glycol |
| 乙炔瓶 | acetylene bottle |
| 乙烷 | ethane |
| 乙醇 | ethyl alcohol |
| 乙醚 | ether |
| 乳剂 | emulsion |
| 乳化管 | emulsion tube |
| 事故预防 | accident prevention, accident simulation |
| 二冲程发动机 | two-stroke engine |
| 二极管 | diode |
| 二极管固定座 | diode holder |
| 二极管散热器 | diode heat sink |
| 二氧化硫 | sulphur dioxide |
| 二氧化碳 | carbon dioxide, carbonic acid |
| 二甲苯 | xylene |
| 二硫化碳 | carbon disulfide |
| 二端交流开关元件 | diac |
| 二道纹锉 | second-cut file |
| 云母 | mica |
| 五缸发动机 | five-cylinder engine |
| 五金件 | hardware |
| 交付前检查 | pre-delivery inspection |
| 交叉的 | cross |
| 交变载荷 | alternating load |
| 交换 | exchange, interchange |
| 交流发电机 | alternator, dynamo, generator |
| 交流发电机传动带 | alternator-drive belt |
| 交流发电机充电指示灯 | alternator-charging control light, battery-charging control light, charge control light, generator control light |
| 交流电 | alternating current |
| 交流电动机 | alternating-current motor |
| 交流电压 | alternating voltage |
| 交流电机 | alternating-current dynamo, alternating-current generator, alternator, three-phase alternator |
| 交点 | cut point, point of intersection |
| 交货期 | delivery period |
| 交货条款 | delivery terms, terms of delivery |
| 交通 | traffic |
| 交通密度 | traffic density, traffic intensity |
