扩孔套圈
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expanded graphite braided ring packing 膨胀石墨扁圆盘根
expanded ring
扩大环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The report was also able to follow the movements of a ring-necked parakeet around London, as the British range of this colourful bird expanded.
ECONOMIST: The oldest bird in the world
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