Pu Tsering, a good-natured primary school teacher, is very stubborn when it comes to which language his students have to speak.
"We should speak standard Tibetan," the 37-year-old language teacher often tells his students at a boarding school in Yushu, a Tibetan autonomous prefecture in northwest China's Qinghai Province.
"As a Tibetan teacher, I'm responsible for preserving our mother tongue,"
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