早期时，启动一台计算机意味着要给计算机喂一条包含引导程序的纸带，或者手工使用前端面板地址/数据/控制开关来加载引导程序。
In the early days, bootstrapping a computer meant feeding a paper tape containing a boot program or manually loading a boot program using the front panel address/data/control switches.
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.
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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