在星云里面，某些部分足够致密而在自身重力影响下开始塌缩。
Within the cloud, some parts are sufficiently dense to start collapsing under their own gravity.
这些是很致密的骨头，并不是骨架里柔软的部分。
These are very dense bones, not a soft area of the skeleton.
巨噬细胞的溶酶体、胞质内致密颗粒和部分质膜也呈现酶活性。
The lysosomes and the dense granules of cytoplasm, as well as on the some area of plasma membrane of the macrophages showed the enzyme activity.
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