New Words：

dictionary [ˈdɪkʃəneri] n. 词典;字典

Sample Sentences：

I don't need the dictionary at present.
This new dictionary is very useful [ helpful] to me.
When you do not understand a word, you can look it up in this dictionary.

useful [ˈjuːsfl] adj.有用的；有益的；实用的；有帮助的
helpful [ˈhelpfl] adj. 有用的;有益的;有帮助的
at present 目前;现在;眼下;当今

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