“假如疫情在全球爆发”可译为：If the pandemic broke out globally 或 If a pandemic broke out across the world。这里用虚拟语气表示假设，从句常用一般过去时，主句可用would/could/might + 动词原形。
- 强调全球范围：globally / across the world / worldwide
- 正式假设：If an epidemic were to break out globally
- 完整例句：If the pandemic broke out globally, many countries would face severe challenges.
注意：已发生疫情用broke out；纯假设可用were to break out。