Language attrition refers to the attenuation of speech act or speech ability caused by the linguistic or nonverbal factors (emotion, motivation, age, reduction or cessation of language use, etc.) of a language in a specific language environment. It has the characteristics of non pathology, gradual change, reversibility and repetition.
According to the above definition, the following belong to language attrition?
Xiao Li's English score in the college entrance examination [microblog] is very good, but his English score is not ideal in the opening class examination after the summer break