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...
雄性动物在求偶时会尽量展示自己，并发出一些声响。Courtship is somewhat vocal with a lot of displaying by the male.鸟类和兽类常在春天求偶.Birds and wild animals often pair in the spring.鸟儿求偶的表现包括雄鸟抖松羽毛的炫耀行为.Courtship will include displays in which the male ...