And I kept asking myself this really simple question: if the ancestors to New World monkeys could somehow cross the Atlantic Ocean, why couldn't humans cross that tiny stretch of water?

如果祖先新世界可以跨越大西洋，为不能跨越小小的狭长水域？

And mandrills are old world monkeys, which is different from new world monkeys.

而且山魈是旧世界，新世界不同。

For example, the yellow fever virus is carried by African wild monkeys, whence it can always infect rural human populations of Africa, whence it was carried by the transatlantic slave trade to infect New World monkeys and people.

例如，黄热病病毒是由非洲野携带的，因此它总是可以感染非洲农村口，而跨大西洋奴隶贸易则携带黄热病病毒感染新大陆的子和。