The drop-out rate among students is currently one in three.现在学生的辍学率是三分之一。You'd be crazy to drop out.你要退学真是发疯了.Research suggests that children whose parents split up are more likely to drop out of high school.研究表明，父母...
这是一桩偶发的事件.It was quite an accident.事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。It became very clear that the incident was not just an aberration, it was not just a single incident.克雅氏病通常以“个例 ” 形式而且在50岁以下的人中偶发.In its common'sporadi...