“请全体同学和老师,到操场集合……”扩音喇叭不断重复着这句话。同学们停止了读书,来到操场。校园里第一次如此寂静,只有“哒哒”的踏步声。操场正前方的两棵树上,挂着一条醒目的红色横幅:红十字会献爱心捐款活动。什 “Please all the students and teachers, to the playground collection ... ” PA speaker repeated this sentence. The students stopped reading and came to the playground. The first time on campus was still, only “da da” footsteps. The two trees in front of the playground are hung with a striking red banner: the Red Cross presents a love donation activity. What