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Terms for subject Explosives and Explosive Ordnance Disposal containing 不 定期 | all forms | in specified order only
| Chinese | English |
| 定期或不定期地给一家双月刊撰稿 | contribute regularly or not to a bimonthly |
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| Chinese | English |
| 定期或不定期地给一家双月刊撰稿 | contribute regularly or not to a bimonthly |