Warning: Duplicate entry '18.189.11.221' for key 'PRIMARY' in /home/paper/htdocs/inc/database.layer.inc.php on line 211 Students learn to make pi(30080)-高一英语阅读(267)-21英语网
Students from the Maurice J. Tobin School make a human Pi symbol (符号) in Boston, US, on March, 13, 2007. It was made during a celebration (庆祝) of Pi Day. Pi Day is an unofficial ...
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