Philosophers had long wondered how to account for essences .

长期以来，哲学家们困惑于如何说明这些本质。

Indeed , all species were defined by their essences , an idea that goes back to aristotle .

确实，世间万物都因其本质被分门别类，这乃是亚里士多德的思想。

He had been indulging in fanciful speculations on spiritual essences , until , like swedenborg , he had an ideal world of his own around him .

他曾一度沉迷于对精神本质的古怪思考，最后，他像史威登保一样营造出了一个自己的想象世界。

But if just one is to be picked , let it be this single-celled algae photographed by marek mis , conveying in its light and color the essences of life itself .

但是，只有由marekmis拍摄的单细胞水藻照片被挑选了出来，因为它传递了生命本质的光与色彩。