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| non-cyclic variation; non-cyclical variation; non-periodic variation; non-periodical variation | |||
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| aperiodic variation; aperiodical variation | |||
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非周期变化 : 8 phrases in 5 subjects |
| Ecology | 1 |
| Engineering geology | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Technology | 4 |
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