One of the most important income sources is collecting Chongcao, which litteraly means worm grass. You can find it everywhere here in Hong Kong at the Chinese medicine shops. People said it is a worm and a grass at the same time. This didn't convince me but it looks just that. It seems to be some kind of symbiosis. Anybody who knows something about this, please tell me. It is a good income for Tibetans, who get four to ten yuan per Chongcao.
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