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。
2
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。
3
If the strength and workability are approximate identical, concrete tends more easily to crack with the increasing sand rate.