He asked them for a letter of recommendation/introduction.他请求他们为他写推荐信/介绍信。He gave me a letter of introduction to the manager.他交给我一封写给经理的介绍信。The firm offered to give her a reference.公司主动给她开具介绍信。He gave me a letter of intro to the manager.他给我一封致经理的介绍信。