When people in developing countries worry about migration, they are usually concerned at the prospect of their best and brightest departure to Silicon Valley or to hospitals and universities in the developed world.
当发展中国家的人们担忧移民时，他们通常担心的是本国最优秀的人才前往硅谷或发达国家的医院和大学的前景。
Without constant migration of digital assets, a nightmare about the foreseeable future is what keeps historians up at night: a historical record that abruptly stops when digital replaces analog.
如果没有持续不断地迁移数字资产，历史学家们就会被一个关于未来的噩梦困扰：当数字技术取代模拟技术时，历史记录会突然中断。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。