erectile dysfunction
noun [ U ] medical specialized uk/ɪˌrek.taɪl dɪsˈfʌŋk.ʃən/ us/ɪˌrek.təl dɪsˈfʌŋk.ʃən/ (also ED)
勃起机能障碍，勃起无力
difficulty in achieving or keeping an erection (= hard penis) so that sexual intercourse is possible
The causes of erectile dysfunction are both physical and psychological. 勃起机能障碍有身体上也有心理上的原因。