Dictionaries are of great importance and use in study, no matter in Chinese learning or English learning.
They are another teachers of us when we need some help.
When we meet new words, the dictionary at hand is the best choice to get help.
The dictionary will tell us how the word pronounces, what it means and how to compose a phrase or sentence.
And it will tell us the words with similar meanings or pronunciations.
With the development of dictionaries, there are various types of dictionaries.
Electronic dictionaries are the new ones. They are very popular among students,because they are easy to use and carry.
But, we should use dictionaries properly and we can't depend on them all the time.
Sometimes we needn't look up every new word in dictionary, but to guess its meaning according to the context.
Besides, some small dictionaries or electronic dictionaries are not so comprehensive, the authoritative ones are the best.