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| 单词 | x-ray fish |
| 释义 | x-ray fish n. A small freshwater fish (Pristella maxillarus) native to South America and often kept in home aquariums, having an almost transparent body with a black stripe on the dorsal fin. Also called x-ray tetra. [So called because its spine and sac of internal organs are visible, giving the impression of an x-ray photograph .] |
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