这些话之所以能够造成经久不衰的情绪号召力，是因为它们提到了也许很困难的行动方针，其背后的推动力是誓死捍卫美国和世界公民的共同价值观。
These words’ enduring emotional appeal is rooted in their embrace of a potentially difficult course of action, motivated by a pledge to uphold values shared by citizens of America and the world alike.