I think the dictionary that people use when they study other language is certainly helpful.
Also dictionary has variey function like pronunciation of word, history and basic sentanse so we can use various way.= Also dictionary has variety of  function like the proper pronunciation of word, history and basic sentence so we can use various way.For example, when I go to other country, I should use their language at least I should speak English however I am not good at English so I serch many words through the dictionary and memorize to converse with other people.=so I search many words through the dictionary and memorize to converse with other people. that's why I always bring it when I go to other counturies.=. that's why I always bring it when I go to other countries. On the other hand, one of function that dictionary has is history which I serched some words.=On the other hand, one of function that dictionary has is history which I search some words. = so If I forget the word, I would like to research again so I can remind  the word.
Therefore, the dictionary is very useful for us.