研究显示婴儿是通过区分明亮区域和黑暗区域来学会观看的。
Research suggests that babies learn to see by distinguishing between areas of light and dark.
你能研究光线和明亮，但不能是黑暗。
在适当的条件下，就能够观察到一系列明亮和黑暗的条带。
It is possible under suitable conditions to observe a series of bright and dark bands.
在适当的条件下，就能够观察到一系列明亮和黑暗的条带。
It is possible under suitable conditions to observe a series of bright and dark bands.
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