Its rate of advance was slow, and the old man gained upon it sensibly.

马车前进的速度很慢，老人显然在一点点靠近。

In contrast, the rate of advance of the Claudius tunnel can be calculated at 1.4 meters per day.

相比之下，克劳迪乌斯隧道的前进速度可以按每天1.4米来计算。

Construction marks left on a Roman tunnel in Bologna show that the rate of advance through solid rock was 30 centimeters per day.

在博洛尼亚的罗马隧道上留下的施工痕迹表明，通过坚硬岩石的前进速度为每天 30 厘米。