求翻译：今天在汽机车间主要学习高中压缸的结构。高中压缸汽缸的结构形式和支撑方式在受热状况改变时，可以保持汽缸自由且对称的收缩和膨胀，并且把可能发生的变形降到最低限度。由合金钢铸造的高中压外缸通过水平中分面形成了上下两半。内缸同样为合金钢铸件并通过水平中分面形成了上下两半。内缸支撑在外缸水平中分面处，并由上部和下部的定位销导向，使汽缸保持与汽轮机轴线的位置与中心线一致，同时使汽缸可根据温度的变化自由收缩和膨胀。是什么意思？

Turbine workshop to learn the structure of the high and medium pressure cylinder. High pressure cylinder cylinder structure and support the change of the heat situation, you can keep the cylinder free and symmetric contraction and expansion, and the possible deformation to a minimum. Alloy steel cas

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Today turbine workshop learning structure of high pressure cylinder. High and middle pressure cylinder cylinder structure in heated situations and support in the form of change, cylinder free and symmetric contraction and expansion can be maintained, and to minimize the deformation may occur. Alloy

Today presses the cylinder in the steam engine workshop main study high school the structure.The high school presses the cylinder cylinder the structural style and the support way when the being heated condition change, may maintain the cylinder freedom also the symmetrical contraction and the infla