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
， “双壳贝！”
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， “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，们将分析的对象限制在一类化石记录保
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.
与其软体动物不同的是,双壳贝缺乏齿舌,具有
,可将食物由鳃送到口部.
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