这也很可能值得说的是抑郁不是一个单一的实体。
It's probably also worth saying that depression is not a single entity.
环境级别将整个系统视为一个单一的实体：黑盒子。
The Context level treats the entire system as a single entity: a black box.
以鸟蛋为例，观赏者必须感觉到它是一个单一的实体形态，而完全不靠它的食用意义。
He must, for example, perceive an egg as a simple single solid shape quite apart from its significance as food.
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