Thus, even a century after Darwin, these aquatic mammals remained an evolutionary enigma.
Thus, even a century after Darwin, these aquatic mammals remained an evolutionary enigma.
因此，即使达尔文过世超过一个世纪，这些海栖哺乳类仍然是个演化谜团。
Thus, even a century after Darwin, these aquatic mammals remained an evolutionary enigma.
因此，即使达尔文过世超过一个世纪，这些海栖哺乳类仍然是个演化谜团。