The piston head or "crown" is the top surface against which the explosive force is exerted.
活塞头部或“冠部”是整个活塞的最上端，处在燃烧室里要承受爆炸燃烧产生的力。
If necessary extend the probe of the dial gauge until you can definitely take measurements on the piston crown.
如有必要，延长百分表的探针，直到可以明确测量活塞顶为止。
This paper studies the fracture mechanics of piston crown crack by means of finite element method and photoelastic method.
本文应用有限元法和光弹性试验对活塞顶的裂纹进行断裂力学分析。
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