ad.  在国外；到国外

ad.  广泛流传

• ≠ domestically   ad. 国内

• We never travelled abroad when we were kids. 我们小时候从来没有去国外旅行过。

• commercial secrets which we did not want to be spread abroad

  我们不想传出去的商业秘密

• D) She is abroad on business. 在国外出差

• A) Taking a vacation abroad. 去国外度假

• This makes commercial space travel a complex legal issue not just domestically, but abroad. 过内外

• For this part, you are allowed 30 minutes to write a short essay on the challenges of studying abroad. 国外学习的挑战

BrE /əˈbrɔːd/   

NAmE /əˈbrɔːd/