From a plant's evolutionary viewpoint, however, it was also a land of
opportunity, free of competitors and predators and full of carbon dioxide and
sunlight
free在这里是什么成分啊 看不懂?
free of sth, 为形容词短语,作land的后置定语(非限制性)。无...的,免...的。
free of charge 免费的。
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