Drying, low-temperature carbonisation, and cracking of gases occur in the upper zone, while permanent gasification of charcoal takes in lower zone.

干燥，低温碳化和气体打击发生在上层，而永久气化木炭在较低的地带占地。

youdao

Drying, low-temperature carbonisation, and cracking of gases occur in the upper zone, while permanent gasification of charcoal takes in lower zone.

干燥，低温碳化和气体打击发生在上层，而永久气化木炭在较低的地带占地。

youdao