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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。
youdao
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The top part of the piston is the head, or crown.
帽子中盖住头顶的部分。
youdao
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The top part of the piston is the head, or crown.
帽子中盖住头顶的部分。
youdao