几个世纪过去了，岩石冷却、硬化，随后收缩、开裂，变成了长长的石柱。
As the centuries passed, the rock cooled and hardened, shrinking and cracking into long columns.
本文系统地研究了HQ系列水溶性淬火剂的工艺性能、冷却能力、淬透性、淬硬性和变形开裂倾向。
The following technological properties of aqueous quenching medium series HQ are systematically studied: cooling ability, harden - ability, tendency of deformation and cracking.
结果表明，由于材料中存在长条状夹杂物及淬火冷却速度过快导致螺母开裂。
The result indicated that crack was caused by lath-shape inclusion in the material and high quenching rate.
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