malfunction       
 verb [ I ]  formal uk/ˌmælˈfʌŋk.ʃən/ us/ˌmælˈfʌŋk.ʃən/
 运转不正常,发生故障
to fail to work or operate correctly
 Synonyms: break (DAMAGE)break down (MACHINE)
Opposites: function work 
 malfunction       
noun [ C ]  formal uk/ˌmælˈfʌŋk.ʃən/ us/ˌmælˈfʌŋk.ʃən/
 失灵,故障
a failure to work or operate correctly
  Shortly before the crash the pilot had reported a malfunction of the aircraft's navigation system. 就在飞机坠毁前不久,飞行员曾报告说导航系统失灵。 
 Synonyms: breakdown (FAILURE)failure (STOP)
Compare: crash noun (FAILURE)