The shear cliff at Yosemite is an example of such rockbreakage.
优胜美地的断崖就是这样一种岩石碎裂的例子。
2
The drill bit is a direct tool for rockbreakage. The rate of penetration is closely related with the drill bit as well as the mechanical properties of the rocks.
钻头是直接破碎井底岩石的工具，钻井速度的快慢不仅与钻头有关，而且与所钻岩石的力学性质密切相关。
3
Ultra-high pressure jet assisted drilling is an affective approach for improving penetration speed; and influential factors and mechanism of rockbreakage are key technologies.