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The term TEU stands for Twenty-foot Equivalent Unit, which is a standard measure used in the shipping industry to describe the capacity of container ships or terminals. It represents the dimensions of a standard twenty-foot shipping container.

On the other hand, an FEU refers to a Forty-foot Equivalent Unit, which is simply double the size of a TEU. Therefore, one FEU is equivalent to two TEUs, which is why the difference between a TEU and an FEU is 20 feet, as the latter is based on a 40-foot shipping container. This standardization allows for easier calculations in logistics and shipping, as it consolidates different container sizes into a common unit of measure.

In summary, the correct answer is based on the direct relationship between the two units of measurement: a TEU corresponds to a 20-foot container, while an FEU corresponds to a 40-foot container, highlighting the fact that the difference in their measurements is 20 feet.