Sent_en: 2zh Watched by thousands of students gathered outside, a fire extinguisher was thrown from the roof, giving glancing blows to two police officers on the ground 70 feet (21 metres) below.
Sent_yy: 在数千名学生聚集在外面的注视下，一个灭火器从屋顶上被扔了下来，砸向70英尺（21米）以下地面上的两名警官。