speech and language therapist       
noun [ C ] uk/spiːtʃ ən ˈlæŋ.ɡwɪdʒ ˌθer.ə.pɪst/ us/spiːtʃ ən ˈlæŋ.ɡwɪdʒ ˌθer.ə.pɪst/ (abbreviation SaLT, SALT)
 言语和语言治疗师
a person who treats people who have difficulty speaking or with language
  She is a speech and language therapist working with people with learning difficulties.  她是一名言语和语言治疗师,帮助有学习困难的人。 
 - More examples
 - The key is getting a child with Asperger's the right help, from an aide in the classroom to a speech and language therapist.
 - The nursery also got advice from an educational psychologist, a speech and language therapist, and a health visitor.
 - I think it would be worth the parents having a chat with a speech and language therapist.
 - Ask your GP for a referral to a speech and language therapist who can assess your child's communication skills.