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Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only withi
[00:07.60]WARMING UP [00:12.15]1 Look at the pictures of these festivals [00:17.19]and discuss the tollowing questions with your partner. [00:22.05]1 Do you know the names of the festivals? [00:34.19]2 Do you know which countries the festivals come f
Now, its time for Words and Their Stories, a program from VOA Learning English that explores common expressions we use every day. Sleep. Its important to our mental and physical health. From a quick cat nap to long, deep beauty sleep, we have many ex
day after day i'm more confused 日复一日,我变得更加困惑 and i look for the light through the pourin' rain 希望在倾盆大雨中看到曙光 you know thats a game that i'd hate to loose 这是我不希望输的游戏, and i'm feelin'
Some bacteria have adapted to super cold environments for millions of years. And scientists have isolated some of the essential genes that allow bacteria to tolerate their harsh living conditionsbecause these same genes might help in the creation of
day after day i'm more confused 日复一日,我变得更加困惑 and i look for the light through the pourin' rain 希望在倾盆大雨中看到曙光 you know thats a game that i'd hate to loose 这是我不希望输的游戏, and i'm feelin'