Another problem is that the study does not establish whether intrinsic properties of junk food cause the reduced intelligence, or whether it's something else.
另一个问题就是这项研究并没有成立是否垃圾食品的内在特性会降低智力，或者有其他什么原因。
One big problem is that it replaces intrinsic motivation with extrinsic motivation.
这种方式的最大问题在于它用外在的激励代替了内在的激励。
Another problem is failed to express the correct or intrinsic interpretation in an abstract formulation system under the guidance of experiments.
另一个问题是这种正确的或者内在的解释无法由一个在实验的指导下的抽象的公式化系统来表示。
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