It is almost impossible to visit all the Vatican collections in one day.
VOA: special.2010.02.03
Humans are collections of cells, all cells are the same in important ways, but cells acquire differences during development, and so we are collections of billions of cells.
人类是一个细胞的集合,细胞在关键方面都是一致的,但在发育中细胞获得了不同的特点,而我们是一个数以十亿计的细胞的集合
So organs are made up of combinations of tissues where all the tissues are collections of cells that are doing some function, nervous tissue, muscular tissue, epithelial tissue, those are examples of tissues that form organs.
所以器官是由各种组织组合而成,所有的组织都是,具有某些功能的细胞集合,神经组织,肌肉组织,上皮组织,这些都是由组织构成器官的例子
All four collections reached the Top 5 on Billboard's Pop Albums Chart.
VOA: standard.2009.11.25
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