Question 19. What is mentioned as a most common danger when people go travelling abroad?

问题19. 文章提到，当人们出国旅行时，什么是最常见的危险？

Add to this, that his long absence from the great world, and total unacquaintance with the common dangers of life, made him form of them an idea far more dismal than the reality.

除此之外，他长期远离伟大的世界，对生活中常见的危险一无所知，这使他形成了一个比现实更令人沮丧的想法。