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Deprecated: Optional parameter $title declared before required parameter $widget is implicitly treated as a required parameter in /home/wellschen/public_html/wp/wp-content/plugins/advanced-categories-widget/inc/class-advanced-categories-widget-fields.php on line 82 奧巴馬開學演講：我們爲何要上學？ Obama’s opening speech: Why do we want to go to school? – YouTube – 程式設計教育農場 by 陳富國