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sand-martin

灰沙燕

Brown-throated Sand Martin棕沙燕

Brown-throated Sand Martin Riparia paludicola褐喉沙燕

生物学

n.swallow of the northern hemisphere that nests in tunnels dug in clay or sand banks

同义词：bank martinbank swallowsand martinRiparia riparia

1.
N（名词） a small brown European songbird, Riparia riparia, with white underparts: it nests in tunnels bored in sand, river banks, etc: family Hirundinidae (swallows and martins) 棕沙燕

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