The Sino-Tibetan language family includes languages spoken across China, Nepal, and Bhutan.
汉藏语系包括在中国、尼泊尔和不丹等地使用的语言。
Students of linguistics often study the complex tonal features of Sino-Tibetan languages.
语言学的学生经常研究汉藏语系语言的复杂声调特征。