5月12日下午两点28分，当地震发生时，有20名五年级学生正在篮球场上排练舞蹈。
The earthquake struck on May 12 at 2:28 in the afternoon as 20 fifth graders were rehearsing a dance on the basketball court in front of the school.
第一章有限差分方法主要内容是一阶和二阶的两点式、三点式和五点式差分方案。
The main contents of first chapter are several difference schemes of first-order and second-order differential equations.
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