菜;
, 
;
足动物,When the Thompson quadruplets espied him one day, they called him a bivalve and ran quickly away.
有
天，汤普森家的四胞胎看见他， “双壳贝！”
When the Thompson quadruplets espied him one day, they called him a bivalve and ran quickly away.
有天，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，他们将分析的对象限制在类化石记录保存完备动物——双壳类软体动物。
Unlike other molluscs, bivalves lack a radula and feature labial palps, which carry food from the gills to the mouth.
与其他软体动物不同的是,双壳贝缺乏齿舌,具有唇瓣,可将食物由鳃送到口部.
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