Since the quinoa boom started, farmers have been pushing for maximum yields — while the scrubland has been cleared.

自藜麦繁荣开始以来，农民一直在努力争取最高产量——而灌木丛已被清理干净。

That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.

这确有其事，因为理论告诉我们如果一个渔场的总储量如果连起初的最大可承受的捕鱼量的50％都不到，就应该降低捕鱼数量了。