当资源枯竭时，狩猎采集者总是可以选择迁移到其他地方，但这对于农业来说则更加困难。
While hunter-gatherers always had the option of moving elsewhere when the resources were exhausted, this became more difficult with farming.
在亚马逊流域，有无数的狩猎采集者，他们生活在世界上最大的沿河生长的树木的枝干上。
There are numberless hunter-gatherers in Amazonia, living along branches of the world's largest river tree.
他们认为，最早发展水稻农业的狩猎采集者一定是在这个南部地区，在现在野生水稻明显的地理范围内。
They argue that the first hunter-gatherers to develop rice agriculture must have done so in this southern zone, within the apparent present-day geographic range of wild rice.
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