When the Thompson quadruplets espied him one day, they called him a bivalve and ran quickly away.
有一天，汤普森家的四胞胎看见他， “双壳贝！”
]双壳类（bivalve的复数）When the Thompson quadruplets espied him one day, they called him a bivalve and ran quickly away.
有一天，汤普森家的四胞胎看见他， “双壳贝！”
To avoid sampling bias, they restricted their analysis to one group of animals—the bivalve molluscs—that fossilise well.
为了防止取样的偏颇，他们将分析的对
在一类化石记录保
完备
——双壳类软
。
Unlike other molluscs, bivalves lack a radula and feature labial palps, which carry food from the gills to the mouth.
与其他软不同的是,双壳贝缺乏齿舌,具有唇瓣,可将食由鳃送到口部.
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