加重钻铤
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So, imagine the pig has a heavy collar and to reward the pig for walking forward you might remove the heavy collar.
所以，想象这头猪带着很重的项圈,作为对这头猪向前走的奖励,你可以把项圈拿掉。
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"A lot of it had to do with the decline of heavy industry, which employed a lot of blacks and blue-collar whites, in a whole set of Rust Belt states, " he said.
CNN: Family roots lure many African-Americans back to South
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