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There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at any s 阅读全文
posted @ 2017-10-14 15:37
gaoren
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A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number 阅读全文
posted @ 2017-10-14 10:21
gaoren
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