这就意味着只有阀门轴的前端面可以作为检测面。

This means that only the front of the valve shaft is accessible.

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在飞轮前端面有一浅凹口，其用来确定第一个气缸中活塞的位置。

In the front face of the flywheel, there is a shallow indentation used to determine the position of the piston in the first cylinder.

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第一金刚石砂轮体(3)的前端面的内侧优选形成大致研钵状的凹形。

The inner side of the head surface of the first diamond grindstone body (3) is preferably formed as a recess with a substantially mortar-like shape.

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