气路系统是压力机不可缺少的部件之一。
Pneumatic system is one of the essential parts of the press.
大屋顶、斜坡面、深出檐、高翘角是中国古代宫殿建筑的特点，而脊吻、走兽又是屋顶装饰不可缺少的部件。
Although big roof, incline plane, long overhang eaves and high rake Angle are characteristics of Chinese ancient palatial architecture, the lips and beasts are parts sine qua non in roof decoration.
因为缺少材料部件，许多受灾地区村子的工厂已经关闭了。
The shortages of components made in affected areas have already shut down numerous factories across the country.
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