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1. 选择步长序列（如: n/2, n/4, ..., 1）
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"There should have been lots of penguins there, but actually we could only see 25 groups," he said. Groups vary in size from 10s to up to 1,000 birds.，更多细节参见WPS官方版本下载
a_list = soup.select("a.post-link")。业内人士推荐safew官方下载作为进阶阅读