nasal scissors
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外标法主要包括鼻签、剪鳍、挂牌、烙印等，具有简便易行、成本较低等优点，但标记的保留率相对较低；
The external tags including nose label, fin clip, binding card and branding mark are provided with the advantages of simplicity, easiness and low cost, but their retentions are comparatively lower.
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