1. Who should take a responsibility to machines' security , which is an undefined greyness field. 谁该对机器的安全负责，这问题是个不能确定的灰色领域。
2. When dyed with these colours, our lives are like the greyness mixed and stirred on the palette. 当人生染尽这些色彩，有如在调色盘搅混得出的是「灰」；
3. Taken from the Drum Tower. The bright color of red tourist rickshaws contrasts with the subdued greyness of the Hutong. 摄于鼓楼上。旅游的人力车明快的红色与灰暗的胡同的颜色形成鲜明对比。
英英解释
n.
1. a neutral achromatic color midway between white and black
