translation.en: So very often, some kind of disaster -- sometimes the consequence, for example, of over-cultivation of silk worms, which was a problem in Europe at the time -- can be the key to something much bigger.
translation.zh: 开山之作 这不少见，有些灾害-- 有些后果，比如 过度种植蚕 成为了当时欧洲的问题-- 可能比一些事情的意义更大