因为它是有用的用英翻译是:because it is useful.扩展资料:useful:英 [ ˈjuːsfl ]美 [ ˈjuːsfl ]有用的,有益的变形:比较级more useful 最高级most useful 例句:1. He offered some useful advice.他提出了一些有益的建议。2. Photos make useful teaching aids.照片可以成为有用的教具。3. My mobile phone is extremely useful.我的手机极为有用。4. Overall, this is a very useful book.总的来说,这是一本很有用的书。5. This information could prove useful.这条信息往后也许有用。