They found that the principal requirement for what is called "global cascades" - the widespread propagation of influence through networks - is the presence not of a few influentials but, rather, of a critical mass of easily influenced people.
他们发现，所谓"全球连锁反应"——即通过网络广泛传播影响力——的主要条件并不是少数影响力者，而是存在一大批容易被影响的人，即所谓的临界质量。
In many parts of the world renewable energy is already a principal energy source.
在世界许多地方，可再生能源已经成为主要的能源来源。
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。