慢速英语:California Gold Rush Pulls Americans West

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fingernail (n.) - the hard covering at the end of your fingers

molar (n.)  - a large tooth near the back of the jaw with a wide surface used especially for grinding food

nugget (n.) -  a solid lump of a valuable metal (such as gold)

rumor (n.) - information or a story that is passed from person to person but has not been proven to be true