You are in line at a grocery store when uh-oh someone sneezes on you. The cold virus is sucked inside your lungs and lands on a cell on your airway lining. Every living thing on earth is made of cells, from the smallest one cell bacteria to the giant blue whale, to you.
你在雜貨店排隊付賬，突然，不妙，有人朝你打了個噴嚏。感冒病毒被吸到了你的肺里，然后降落在你的氣道黏膜上。地球上所有的生物都是由細胞組成的，從最小的單細胞到巨大的藍鯨，還有你都是如此。
詞匯講解1：
be in line?排隊
at a grocery store?在雜貨店
living thing?生物
be made of?由……組成
Each cell in your body is surrounded by a cell membrane. A thick flexible layer made of fat and proteins that surrounds and protects the inner components. It’s a semi permeable, meaning that lets something pass in and out but blocks others. The cell membrane is covered with tiny projections. They all have functions, like helping cells adhere to their neighbors, or binding to nutrients the cell will need. Animal and plant cells have cell membranes. Only plant cells have a cell wall which is made of richest cellulose that gives the plant structure.
你身體里的每一個細胞都是被細胞膜所包起來的。那是由脂肪和蛋白質(zhì)組成的一層既厚又有彈性的物質(zhì)，包圍著并保護著細胞內(nèi)部。細胞具有半滲透性，意味著它讓有些東西自由進出，但阻擋其他的東西。細胞膜上有很多突出的部分。比如幫助細胞吸附住鄰近的細胞或幫細胞連接上營養(yǎng)物質(zhì)。動物細胞和植物細胞都有細胞膜，但是只有植物細胞有細胞壁，它由豐富的細胞膜質(zhì)構(gòu)成，它賦予了植物支撐結(jié)構(gòu)。
詞匯講解2：
cell membrane?細胞膜
be surrounded by?被……包圍
be covered with被……覆蓋
membrane?細胞膜
