难道你生活中还没有足够多的纸吗？
目前还没有足够多的实证研究结果支持这个模型。
While I'd like to tell you about a whole series of empirical studies that have found support for this model, I can't because they don't exist.
作者警告说，全世界并没有足够多的耕地都改种玉米和大豆。
The authors warned there just was not enough cropland available to shift to corn and soybeans.
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