P: He received seven injections of streptomycin when he got pneumonia two years ago. His hearing seems to have gotten worse since then.
P: He received seven injections of streptomycin when he got pneumonia two years ago. His hearing seems to have gotten worse since then.
两年前他因患肺炎注射过七针链霉素，从此后耳聋就更加重了。