a seal's flipper is homologous with the human arm.
海豹状肢与人胳膊是同。
a seal's flipper is homologous with the human arm.
海豹状肢与人胳膊是同。
it swam away in a flurry of wings and flippers, raising a snowstorm of foam.
突然划动双翼和状肢游走了,翻起了一大片泡沫。
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