In order to facilitate bile extraction, the bears undergo an invasive surgical procedure where a permanent wound is created in their gall bladder and abdominal wall.

为了抽取胆汁，要在取胆黑熊的腹部通过手术制造一个长期不能愈合、深入腹腔直达胆囊的伤口。

youdao

Digestive bile is forcibly extracted from the gall bladders of bears, to be sold on the black market for use in traditional medicine.

BBC: Moon bear in Vietnamese bear farm