下面句子中有两个错别字，请改正后用正楷字将整个句子抄写在米字格中。

心弛神往中国梦，愤发图强学子情。

    I have two pen ____. They ____ Zhang Ming and Zhao Ping. Zhang Ming is ____ Shanghai. Zhao Ping is in Beijing. We like ____. We are all in sports clubs(俱乐部) at school. I ____ play basketball. Zhang Ming likes ____. And Zhao Ping often ____ ping-pong. ____ we like different(不同的) food. I like vegetables. Zhang Ming likes ____ hamburgers and Zhao Ping eats lots of fruit every ____.

根据材料，提炼一个主题，并结合材料中的史实加以说明（要求：主题鲜明，逻辑严密，史论结合。）

图中虚线为匀强电场中与场强方向垂直的等间距平行直线，两粒子M、N质量相等，所带电荷的绝对值也相等，现将M、N从虚线上的O点以相同速率射出，两粒子在电场中运动的轨迹分别如图中两条实线所示．点a、b、c为实线与虚线的交点，已知O点电势高于c点．若不计重力，则（   ）