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采挖

Coal is indeed a cheap source of energy , but its extraction is extremely costly to the environment.

By using the method , the excavation of the dendrobium officinale is reduced and the growth period of the dendrobium officinale is shortened .

Excavation of the standard length 25 cm, of which 18 ~ 20 cm was buried in the earth part, yellow, blue green partially excavated.

Outside Hong Kong , the species is under threats because of destruction of the habitats and over-collection by amateur horticulturists .