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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. When it comes to flu shots, the more the merrier. Happily, that doesnt mean you need to get jabbed more than once. What it does mean, according to two re
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By Gary Thomas Washington 02 March 2006 Part of the reason for President Bush's trip to Pakistan is to bolster support for anti-terrorist efforts against remnants of the Taleban and al-Qaida. But as V
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句号 Period [．] 用以表示一个句子的结束 Hockey is a popular sport in Canada． The federal government is based in Ottawa． 用在缩写中 B．C． is the province located on the West Coast． Dr． Bethune was a Canadian who worked in
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