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| English | Chinese |
| four-by-four | 4 × 4 汽车 (vehicle) |
| four-by-two | 4×2 汽车 |
| four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke | 四冲程发动机 (内燃机，其周期是由四个活塞冲程完成;包括吸气冲程、压缩冲程、膨胀冲程和排气冲程。) |