A cell is the basic unit of life. A cell is the smallest structure that can live and reproduce. Cells grow and develop, reproduce and interact with the environment.
细胞是生命的基本单位，是能够生存和繁殖的最小结构。细胞生长、发育、繁殖并与环境相互作用。
Photosynthesis is one of the most important biological processes. It allows plants to capture and use light as an energy source. Photosynthesis is the process of converting light energy into chemical energy.
光合作用是最重要的生物过程之一，可以让植物吸收，用光作为能源。光合作用是把光能转化为化学能的过程。
A virus is a small biological structure that attacks and enters cells. Once inside a cell, a virus reproduces and makes many copies of itself. Some diseases such as influenza are viruses.
病毒是一种攻击并进入细胞的小型生物结构。一旦进入细胞，病毒就会繁殖，自我复制很多次。有些疾病如流感就是病毒。
Bacteria are one-celled forms of life that are all around us. Although they have a single-cell structure, they are very important. Many bacteria are inside us and help us digest our food.
细菌是生活在我们身边的单细胞生物，尽管只是单细胞结构，但它们非常重要。许多细菌在我们体内帮助我们消化食物。
DNA is a complex molecule that stores information and can make copies of itself. Nearly every cell in a person's body has the same DNA. The information stored in DNA tells cells what to do, and is necessary for reproduction.
DNA是一种复杂分子，可以储存信息并自我复制。人体内几乎所有细胞都有相同的DNA。DNA中的存储信息告诉细胞该做什么，这是繁殖所必需的。
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