N-COUNT A porthole is a small round window in the side of a ship or aircraft. 舷窗; 舱口
Cylindrical gears reduction gear box lid's machine-finishing process engineering and milling port hole end surface's unit clamp design;
圆柱齿轮减速器箱盖的机械加工工艺过程设计及铣削观察孔端面的专用夹具设计；
The way this burner system melts metal is simply by pushing the flame exit port up against the hole in the furnace which ordinarily would hold the propane burner (or air blast on a charcoal furnace).
这种燃烧器的方式系统的金属熔体的火焰推出境口岸打击在炉内的通常会举行一个木炭炉的丙烷燃烧器。
The neutron flux of reactor center port-hole is one of the important parameters for applications.
反应堆中央孔道中子注量值是反应堆的重要指标，也是反应堆应用的重要参数。
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