For example, Apple, according to the "A" at the beginning, locks A to find it.
Followed by the letter "P", look up class A vocabulary. Ab, ac, ad, ... Associated Press (abbreviation for Associated Press)
The third letter is still "P", continue to search in ap, apa, apb, apc, ..., app. ..
The fourth letter is "L", so find appa, appb, appc, ... to apply in the application.
By analogy, you can find the word you are looking for.
In addition, there are special names, place names, country names and unit conversion tables attached to the last pages of the dictionary.