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| 时效变化 | |||
| 世纪性变化 | |||
| 长期性变化; 多年变化 | |||
| 时效〔长期〕变化; 老化 | |||
| 长期变化; 缓慢变化 | |||
| 世纪变化; 多年变化长期缓慢变化; 长期而缓慢的变化; 长期变异 | |||
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| 长周期变化 | |||
| secular variation: 2 phrases in 1 subject |
| Technology | 2 |
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