The specific expression of input enhancement is text annotation. The prototype of early annotations originated from the scribbling of information in the blank spaces of the text when students in the Middle Ages read foreign language texts. With the development of time, the annotation information has been compiled into vocabulary and dictionary, and the auxiliary teaching significance of annotation has gradually become prominent (Roby, 1999). In second language teaching, in order to improve reading fluency and reduce dyslexia caused by new words, short definitions or synonyms are usually used next to key words or low-frequency words to explain, such explanatory information is text annotations.
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