translation.en: So if you actually do the research, you find out that in the world there are about 50,000 different types of spiders, and there are about two dozen that are venomous out of 50,000.
translation.zh: 如果你真正地做了研究， 你就会发现， 在世界上有约 5 万种不同类型的蜘蛛， 在这 5 万种蜘蛛中， 大约有 24 余种 是有毒的。