这些动物早已拥有四色觉，但关键的区别是，他们的第四种颜色位于高频的紫外线区域，在人类可视范围之外。
Those creatures have long had four-color vision, but a key difference is that their fourth type of color detector is in the high-frequency ultraviolet range, beyond where humans can see.
上述日期代码范围之外的产品，或在银色铭牌(位于产品背部)上有圆形绿色标签贴纸的产品，不在此次召回之列。
Products with a date code outside of the range indicated above, or with a round green sticker on the silver rating label (found on the back of the product), are not included in this recall.
上海的案例说明，那些位于帝国正式边境范围之外的社区，通过想象与真实相结合的策略将自己纳入想象的帝国社区。
The Shanghai case study tells us that the strategies for incorporation, imagined and concrete, into the imagined community of empires of those outside its formal boundaries.
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