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| 51. | quaternary ammonium halide |
| 季铵卤化物 |
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| 52. | quaternary volcanic rocks |
| 第四纪火山岩 |
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| 53. | quaternary ammonium salts |
| 四级铵盐 |
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| 54. | quaternary glacial period |
| 第四纪冰期 |
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| 55. | quaternary ammonium polymer |
| 季铵聚合物 |
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| 56. | the Quaternary period |
| 第四纪 |
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| 57. | Quaternary Environmental Sciences |
| 第四纪环境学 |
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| 58. | quaternary eutectic alloy |
| 四元共晶合金;铋锡铅镉易熔四元合金 |
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| 59. | fatty quaternary amine |
| 脂肪族季胺盐 |
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| 60. | quaternary stibonium hydroxide |
| 季锑碱|氢氧化季锑 |
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