所以速度的符号,和平均加速度的符号,这二者都取决于,这里x正方向,是如何定义的,和0点的选取没有关系。
So the signs in the velocity and the signs in average acceleration depend crucially on how I have defined my increasing value of x not where I choose my zero points.
由于速度极慢，应选取研磨得极细的咖啡粉来萃取。
Due to extremely slow speed, should select a very fine abrasive powder to extract the coffee.
实验结果表明，利用遗传算法可以有效地提高原有图像阈值选取方法的速度。
The results of experiments show that genetic algorithms can greatly improve the speed of original method in selecting image thresholds.
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