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| 51. | four-vertex theorem |
| 四顶点定理 |
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| 52. | four-channel disc |
| 四声道唱片 |
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| 53. | four-electrode method |
| 四极法 |
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| 54. | four fluted tap |
| 四槽丝锥 |
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| 55. | Four-Fish jelly |
| 四鱼软糖 |
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| 56. | four-point switch |
| 四接点开关 |
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| 57. | Four-Flower jelly |
| 四花软糖 |
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| 58. | four factor formula |
| 四因子公式 |
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| 59. | four-lens camera |
| 四镜头摄影机 |
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| 60. | four hearth burner |
| 四膛炉 |
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