| Source | Target | | 喷漆器 | paint spray |
| 喷漆室 | paint-spray booth, painting box, spray-painting booth |
| 喷砂器 | sandblaster |
| 喷雾 | spraying mist |
| 喷雾式化油器 | spray carburetor, spray carburetter |
| 嗡嗡声 | drone, drum, roar |
| 嘈杂的 | noisy |
| 嘈杂音 | wild noises |
| 噪声控制 | noise control |
| 噪声级 | noise level, sound intensity level, sound level |
| 噪声虑波器 | noise filter |
| 噪音 | noise |
| 四乙铅 | tetra-methyl lead |
| 四冲程内燃机 | otto engine |
| 四冲程发动机 | four-cycle engine, four-stroke engine |
| 四柱举升机 | four-post lift |
| 四缸发动机 | four-cylinder engine |
| 四缸转子发动机 | four-rotor engine |
| 四腔汽化器 | four-barrel carburetor, four-barrel carburetter |
| 四舍五入 | round, round off |
| 四轮转向 | four-wheel steer arrangement, four-wheel steering |
| 四轮驱动 | four-wheel drive |
| 四轮驱动汽车 | four-wheel drive car |
| 四轴承 | four-bearing, quadruple-bearing |
| 四边形 | quadrangular, quadrate, rectangular |
| 四速变速箱 | four-speed gearbox |
| 回位作用 | caster, castor, caster action, castor action |
| 回收利用 | recycle |
| 回油活门 | fuel-return valve |
| 回流管路 | return line |
| 回流阀 | return valve |
| 回火色 | temper color, temper colour |
| 回程 | back stroke, descending stroke |
| 回程盘 | set plate |
| 回跳间隙 | rebound clearance |
| 回转轴 | axis of revolution, axis of rotation, rotation axle, rotational axis |
| 回转阀 | rotary valve |
| 固体的 | solid |
| 固体继电器 | solid-state relay |
| 固定 | secure |
| 固定制动器钳 | fixed brake caliper |
| 固定喉管化油器 | fixed-choke carburetor, fixed-choke carburetter |
| 固定强度 | holding strength |
| 固定挡料销 | solid stop |
| 固定提前 | fixed advance, set pre-ignition |
| 固定支撑 | fixed stay |
| 固定架 | holder |
| 固定点 | anchorage point |
| 固定的 | stationary |
| 固定绕组 | hold-on winding |
| 固定螺钉 | fixing screw |
| 固态点火 | solid-state ignition, transistor ignition, transistorised ignition, transistorized ignition |
| 国籍标签 | nationality label, nationality plate |
| 图例 | legend |
| 圆 | circle |
| 圆周力 | circumferential force |
| 圆周运动 | circular movement |
| 圆周速度 | circumferential speed |
| 圆嘴钳 | round-nose pliers |
| 圆头螺钉 | round-head screw, rounded-head screw |
