“求助于”用英语怎么说

他们求助于该市最具创新风格的一家博物馆。For assistance, they turned to one of the city's most innovative museums.他有困难时从不求助于我们.He never refers himself to us when he has difficulties.她的自尊心太强,从不求助于人.She had been too proud to ask for help....