The one-way arrow in the Longman electronic dictionary usually represents a new word that is obtained by removing the root affixing of a word (such as "un-"). For example, the root of the word "unsorted","un-", meant "not", and the word "sorted" meant "sorting". The function of the one-way arrow was to make it convenient for the user to quickly check the root affixing of a word and quickly find the word related to the root affixing. For example, if a user wanted to find a synonym for the word "sorted", they only needed to type "unsorted" and a one-way arrow in the search box. It should be noted that the one-way arrow only indicates that the root of a word is removed, but it does not indicate the change in the meaning of the word. For example, the word "unsorted" still meant "sorted", but the word "sorted" didn't appear in the word.