One of the key scientific questions in cosmology today is: what is the average density of matter in our universe?
今天宇宙学的一个关键问题就是：宇宙中物质的平均密度是多少？
The key to this is the reduced density of the atmosphere, which affects how fast the ball moves through the air and also the bend of a spinning ball.
此处的关键在于大气的折合密度，它会影响球在空中穿越的速度以及旋转球的弯曲度。
Flexible OLED technology may be the key because it can provide the rich color and resolution density needed for a smaller screen without being a power hog and resists damage by its malleable nature.
而柔性oled技术可能是其中的关键，因为它能够提供丰富的色彩和高分辨率以适应较小屏幕的需要，同时更加节能抗磨。
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