1.Bryan feared that if he signed the letter, it would provoke war with Germany. Rather than sign it, he resigned.
但布莱安深恐，一旦他签署了这封信，将会激起两国间的战争，所以他选择辞职不签署信件。
2.Just glance at Sherif's Robbers Cave experiment for proof of how easy it is to provoke war between groups.
只要去看看Sherif做的RobbersCave实验就能够发现，要挑起不同群体间的冲突是多么容易的一件事。