Occasionally, there's so much tissue damage that blood vessels break and create blood filled bullae on the skin above gangrenous tissue.

某些情况下，组损伤较严重而累及血管，会在坏疽组形成血性疱。

Canids have hollow bony structures toward the back of their skulls called auditory bullae that protect the delicate bones of the middle ear.

犬科动的头骨后部有中空的骨结构，称为听，可保护中耳的脆弱骨骼。

In the skin, Marfan syndrome can cause stretch marks, and in the lung it can cause bullae to form, which are large spaces that replace the normal architecture of the lungs and can cause a pneumothorax to form.

马方综合征在肤上现为纹，在肺上现为肺疱形成；肺疱巨的体积占据了肺的正常结构，也可能引起气胸。