Modem humans, Martin said, created havoc as they spread through the Americas, wielding spears to annihilate animals that had never faced a technological predator.

马丁说，现代人类在美洲繁衍的过程中对当地造成了严重破坏，他们向动物投掷长矛并杀害他们，而那些动物从未见过带有这些技术的捕食者。