a harsh and strident sound (as of the grinding of gears)
the wearing down of rock particles by friction due to water or wind or ice
grindings的用法和样例:
例句
Stepped out ten feet and then put a mark in the ground. 量出10英尺; 然后在地上做个记号。
Smith ground out his three novels a year for over30 years. 史密斯每年涂写出三部小说,30多年来,年年如此。
In digital signal technique, a signal that uses a positive(or negative) excursion and ground as the two binary signal states. 在数字信号技术中,用正(或负)向电压与地两个电平来表示二进制“1”和“0”的一种信号