By 375m years ago, the descendants of these first-footers had evolved four limbs clearly recognisable as legs.
大约3亿7千5百万年前，第一批鱼类类“登陆者”的后代进化出了四肢（可以清晰的看出来是腿）。
By 375m years ago, the descendants of these first-footers had evolved four limbs clearly recognisable as legs.
大约3亿7千5百万年前，第一批鱼类类“登陆者”的后代进化出了四肢（可以清晰的看出来是腿）。
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