She jumped the fourth grade in primary school.她跳过了小学四年级.Children enter primary school at the age of 7.孩子们7岁进小学.I started primary school when I was 5 years old.我五岁时开始读小学....
会厌起着声门的保护盖作用.Glottis epiglottis plays the role of the protective cover.结论: 经口腔会厌囊肿造袋术是治疗会厌囊肿的一种简单 、 安全且有效的方法.Conclusion: Transoral laser marsupialization is a simple, safe, and effective method for treatment of epiglotti...