三胡，“三弦胡琴”的简称。是20世纪70年代在二胡的基础上改制而成的一种新乐器。音色明亮淳厚，表现力强，可用于独奏、重奏、器乐合奏或为歌舞伴奏。琴筒有八方形、六方形、双筒等几种。另有东胡、楼烦和林胡，史称“三胡”。东胡，约有今辽宁西部和西北部、河北北部和内蒙古哲里木盟、昭乌达盟一些地方。林胡，约有今内蒙古河套地区。楼烦，约有今山西西北部和内蒙古集宁一带。
地质专业大三学生胡安路易斯决定做一个有关地震如何发生的内容翔实的演讲。
Juan Louis, a junior geology major, decided to give an informative speech about how earthquakes occur.
星期三早上一架飞机起飞前往俄勒冈州，胡安的信件就在这架飞机上。
An airplane took off for Oregon on Wednesday morning. Juan's letter went on the airplane.
内塔尼亚胡坚称，萨拉——他的第三任妻子及两个儿子的母亲，小心翼翼地保持着与国家事务的距离。
Mr Netanyahu insists that Sara, his third wife and mother of his two sons, keeps scrupulously out of affairs of state.
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