jerky       
 noun [ U ] US uk/ˈdʒɜː.ki/ us/ˈdʒɝː.ki/
 (条状)肉干
meat that has been cut into long, thin strips and dried 
  beef jerky 牛肉干 
 jerky          
adjective uk/ˈdʒɜː.ki/ us/ˈdʒɝː.ki/
 忽动忽停的;抽动的,痉挛性的
quick and sudden
  The disease causes sudden jerky movements of the hands and legs. 这种疾病会导致手腿突然痉孪。 
  不平稳的,让人不舒服的
not smooth and pleasant
  I enjoyed the concert, although the playing was kind of jerky at times. 尽管演奏时有不稳,但我仍然很享受这场音乐会。