用字典學英文字....

Use a Dictionary is USEFUL in daily life
The best thing you can do to improve your spelling is use a dictionary. You will rarely spell words wrong if you will consult a dictionary whenever you are in doubt. Know when you don’t know how to spell a word and look it up. Yes, it will take time but it takes time to do anything right.

The decision whether to use a dictionary or not depends upon the task at hand. When the student is engaged in fluency work, such as in a conversation or reading fluently, then the use of the dictionary will severely disrupt the communication flow. However, if communication completely breaks down because of the unknown word, the student should first try to guess the word from the context and only resort to the dictionary if absolutely necessary. On the other hand, if the task involves language study, then the use of a dictionary as a primary tool is more acceptable.

用字典係日常生活中學英文生字有用,Because

It trains us to become independent of a dictionary.
It forces us to think more deeply about the word and it also makes us better guessers.
It increases mental effort so the chances of remembering the word will be higher.

Why use a dictionary in daily life?

1) to learn meanings of unfamiliar words
2) to find correct spellings
3) to find out how to correctly use a word – as what part of speech
4) to find the pronunciation for a word
5) to find the derivation of a word (the origins of the word )
6) to find the correct spellings of derivatives (root words with suffixes or other regular endings )

You can improve spellings by,

1. See more words
2. Spell more
3.(MUCH FUNNIER) Spell while you skip ropes.

用字典學英文生字有用

I think reading books to learn vocabularies is more powerful than learning from a dictionary. Some words in the dictionary are not used frequently.

Definitly, but you need some example to understand it, and you need to use it , other wise you will forget it very easily.