1. Maps of cities are really helpful when you go travelling in foreign countries. （这里的重要其实是有用的意思.）
直译：Maps of cities play an important role when you go travelling in foreign countries.
2. In her daily life, how to use computer properly is a main topic.
3. Do you mind telling me the main functions of this computer? No, not at all.
4. You can write an article on your computer by creating a word document.
5. The police failed to find the thieves after two hours' searching. 1. Maps of cities are really helpful when you go travelling in foreign countries. （这里的重要其实是有用的意思.）
直译：Maps of cities play an important role when you go travelling in foreign countries.
2. In her daily life, how to use computer properly is a main topic.
3. Do you mind telling me the main functions of this computer? No, not at all.
4. You can write an article on your computer by creating a word document.
5. The police failed to find the thieves after two hours' searching.