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Cell
細胞
Every living thing has at least one cell.
每個生物至少有一個細胞。
Then, what is a cell?
那么，什么是細胞呢？
Every cell works differently, but most cells work to maintain life.
每個細胞的功能都不相同，但大多數(shù)的細胞都有維持生命的作用。
Therefore, a cell is often called the building block of life.
因此，細胞常被稱作是構(gòu)成生命的基本單元。
A small house needs a small number of bricks, a big house needs many bricks.
小房子需要少量的磚塊，大房子則需要很多磚塊。
Similarly, small organisms need only a few cells.
同樣，小型生物僅需要幾個細胞。
For example, most bacteria have only one cell.
例如，大多數(shù)細菌僅有一個細胞。
But big organisms like animals or plants need a lot of cells.
而像動植物這樣的大型生物則需要大量的細胞。
How many cells do people have?
人有多少個細胞呢？
They have about 100 trillion cells!
人約有100萬億個細胞！
