A sharp crack might remain fairly sharp in granite, but degenerate into a dull thud in sand.

在花岗岩中尖锐的破裂声可以保留相当的强度，而在砂岩中则易变成低沉的轰响。

Research has believed that veining in admission and exhaust passage of diesel engine cylinder head may mainly be caused by crack of sand core occurring in high temperature phase change expansion.

研究认为，柴油机气缸盖进、排气道脉纹的产生主要是由硅砂高温发生相变膨胀导致砂芯开裂引起的。

If the strength and workability are approximate identical, concrete tends more easily to crack with the increasing sand rate.

在强度和工作性相当的情况下，随着砂率的增大，混凝土出现裂缝的机会增加了。

This paper analyzes detailed the causation of the vacuole, irregular crack, sand out, surface pit, and brings up treatment and prevention measure.

本文对水泥地面经常出现的空鼓、不规则裂缝、起砂和麻面等问题原因进行了详细分析，并提出了处理与预防措施。

Base layer must be toweled, firm, free of defects such as bump, crack, sand and void, etc. Hand-over inspection shall be done together with supervision engineer.

基层必须抹光、坚实、牢固，无空鼓、松动、起砂、麻面等缺陷，并会同监理工程师严格执行交接检查。