Scientists had assumed that great mass would have produced selective pressure for the larger sacrum, but now they know that the sacral enlargement came first.
科学家以前猜测可能是种群太大导致的竞争压力使蜥脚龙最终产生了，不过现在他们知道了蜥脚龙从何处分化而来的。
Scientists had assumed that great mass would have produced selective pressure for the larger sacrum, but now they know that the sacral enlargement came first.
科学家以前猜测可能是种群太大导致的竞争压力使蜥脚龙最终产生了，不过现在他们知道了蜥脚龙从何处分化而来的。
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