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Acid 酸 Why does the lemon taste sour? 为什么柠檬的味道很酸? It is because of the acid in a lemon. 因为柠檬里有酸。 Then what is acid? 那么什么是酸? All substances with a sour taste are kinds of acid. 所有带酸味的物质
'The Last Leaf,' by O. Henry 《最后一片叶子》by欧亨利 Our story today is called The Last Leaf. It was written by O. Henry. Here is Barbara Klein with the story. Many artists lived in the Greenwich Village area of New York. Two young women
New research suggests ayahuasca, a jungle vine found in the Peruvian rainforest, can have a powerful effect on the human central nervous system when brewed with other plants. Researchers say one of ayahuasca's most promising uses could be in treating
RACHEL MARTIN, HOST: Even with all the VA clinics and hospitals, that $180 billion budget for the U.S. Department of Veterans Affairs, even with all those resources, the day-in-and-day-out care of disabled veterans often falls to their own family mem