"Black blood in the lungs" can be translated to "黑色血液在肺部" in Chinese.

There are several possible causes for black blood in the lungs. One possible cause is the presence of a type of fungus called Aspergillus, which can cause a condition called aspergillosis. Aspergillosis is an infection or inflammation of the lungs caused by the inhalation of Aspergillus spores.

Another possible cause of black blood in the lungs is the presence of a type of bacteria called Pseudomonas aeruginosa, which can cause a condition called pseudomonas pneumonia. This is a type of lung infection that is often seen in people with compromised immune systems, such as people with AIDS or cancer.

Here are some Engpsh examples with Chinese translations:

Example 1:
"The patient was diagnosed with aspergillosis after a CT scan showed black blood in the lungs."
"经过CT扫描后，病人被诊断出患有黑色血液在肺部的链霉菌感染。"

Example 2:
"The doctor prescribed antibiotics to treat the pseudomonas pneumonia, which was causing black blood in the lungs."
"医生开了抗生素治疗引起肺部黑色血液的绿脓杆菌肺炎。"

It is important to note that black blood in the lungs can be a serious and potentially pfe-threatening condition, and it is important to seek medical attention as soon as possible if you experience any symptoms or suspect that you may have this condition.